Union Arena That Time I Got Reincarnated as a Slime booster display$162today

Is a That Time I Got Reincarnated as a Slime booster display worth opening?

Union Arena. 16 packs of 12 cards. Released 26 June 2026. Prices from 15 October 2026.

TCGplayer today

$162.26

Lowest listing
$159.95
Per pack
$10.14

Keep it sealed$88 of cards inside, after selling costs

Estimated contents: nobody has published measured pull rates for this box yet, so we use those of boxes with the same pack layout. Treat the numbers as a rough guide.

See the mathPrice history

Why we'd keep it sealed

The cards inside are worth $88 after selling costs. The box costs $162.

On average you lose $74 per box. Buying the singles you want is cheaper.

Pull rates are still uncertain. The real value could be anywhere from $55 to $139.

If you opened 100 boxes

  • 17 make money
  • 83 lose money

A typical box is worth $46. 1 in 10 boxes is worth $278 or more, and 1 in 10 is worth $28 or less.

The math, per box

From the price of every card to what you'd actually keep.

Per box of 16 packs

Box price on TCGplayer
$162
Cards inside, at market prices
$131
Selling costs and bulk
−$43
Cards inside, after selling costs
$88
Compared with the box price
−$74

From 100,000 simulated boxes. Selling costs: 13% fee, $0.30 per card sold, cards under $1.00 go to bulk at $0.01.

Cards inside, at market prices
The average value of everything in a box, with each card at its price on TCGplayer today.
Selling costs and bulk
TCGplayer's fee and postage for every card worth selling. Cheap cards go to bulk for a few cents.
Cards inside, after selling costs
What an average box puts in your pocket once everything is sold.
Compared with the box price
Plus means the average box is worth more than it costs. Minus means it's worth less.

What the box costs

Today's price on TCGplayer, and how the box price and the cards inside have moved.

TCGplayer today
$162.26$10.14 per pack
Lowest listing
$159.95
  • Box price on TCGplayer
  • Cards inside, after selling costs
Box price and the cards inside, day by dayFrom 14 Oct to 15 Oct, the box price went from $162 to $162, and the cards inside, after selling costs, from $88 to $88.$75$100$125$150$175Box$162Cards$8814 Oct15 Oct14 Oct: box $162, cards $8815 Oct: box $162, cards $88Box price and the cards inside, day by dayFrom 14 Oct to 15 Oct, the box price went from $162 to $162, and the cards inside, after selling costs, from $88 to $88.$75$100$125$150$175Box$162Cards$8814 Oct15 Oct14 Oct: box $162, cards $8815 Oct: box $162, cards $88
On days when the cards line sits above the box line, an average box was worth more than it cost. Selling costs use our defaults.
Show as a table
DayBox priceCards inside, after costs
15 October 2026$162.26$87.82
14 October 2026$162.26$88.32

What 100,000 simulated boxes were worth

Every box is different. This is how the value of each simulated box came out, after selling costs.

Value of 100,000 simulated boxes83 of every 100 simulated boxes were worth less than the box price of $162.Box price $162Lose moneyMake money0102030$100$200$300$382+Boxes out of 100Under $22: 2 of 100 boxes$22 to $32: 16 of 100 boxes$32 to $42: 24 of 100 boxes$42 to $52: 18 of 100 boxes$52 to $62: 11 of 100 boxes$62 to $72: 6 of 100 boxes$72 to $82: 3 of 100 boxes$82 to $92: 1 in 88 boxes$92 to $102: 1 in 222 boxes$102 to $112: 1 in 606 boxes$112 to $122: 1 in 1,562 boxes$122 to $132: 1 in 1,887 boxes$132 to $142: 1 in 303 boxes$142 to $152: 1 in 179 boxes$152 to $162: 1 in 246 boxes$162 to $172: 1 in 418 boxes$172 to $182: 1 in 746 boxes$182 to $192: 1 in 274 boxes$192 to $202: 1 in 96 boxes$202 to $212: 1 in 92 boxes$212 to $222: 1 in 116 boxes$222 to $232: 1 in 108 boxes$232 to $242: 1 in 142 boxes$242 to $252: 1 in 260 boxes$252 to $262: 1 in 299 boxes$262 to $272: 1 in 174 boxes$272 to $282: 1 in 122 boxes$282 to $292: 1 in 105 boxes$292 to $302: 1 in 90 boxes$302 to $312: 2 of 100 boxes$312 to $322: 2 of 100 boxes$322 to $332: 1 in 83 boxes$332 to $342: 1 in 155 boxes$342 to $352: 1 in 295 boxes$352 to $362: 1 in 633 boxes$362 to $372: 1 in 1,316 boxes$372 to $382: 1 in 1,538 boxes$382 or more: 2 of 100 boxesValue of 100,000 simulated boxes83 of every 100 simulated boxes were worth less than the box price of $162.Box price $162Lose moneyMake money0102030$100$200$300$382+Boxes out of 100Under $22: 2 of 100 boxes$22 to $32: 16 of 100 boxes$32 to $42: 24 of 100 boxes$42 to $52: 18 of 100 boxes$52 to $62: 11 of 100 boxes$62 to $72: 6 of 100 boxes$72 to $82: 3 of 100 boxes$82 to $92: 1 in 88 boxes$92 to $102: 1 in 222 boxes$102 to $112: 1 in 606 boxes$112 to $122: 1 in 1,562 boxes$122 to $132: 1 in 1,887 boxes$132 to $142: 1 in 303 boxes$142 to $152: 1 in 179 boxes$152 to $162: 1 in 246 boxes$162 to $172: 1 in 418 boxes$172 to $182: 1 in 746 boxes$182 to $192: 1 in 274 boxes$192 to $202: 1 in 96 boxes$202 to $212: 1 in 92 boxes$212 to $222: 1 in 116 boxes$222 to $232: 1 in 108 boxes$232 to $242: 1 in 142 boxes$242 to $252: 1 in 260 boxes$252 to $262: 1 in 299 boxes$262 to $272: 1 in 174 boxes$272 to $282: 1 in 122 boxes$282 to $292: 1 in 105 boxes$292 to $302: 1 in 90 boxes$302 to $312: 2 of 100 boxes$312 to $322: 2 of 100 boxes$322 to $332: 1 in 83 boxes$332 to $342: 1 in 155 boxes$342 to $352: 1 in 295 boxes$352 to $362: 1 in 633 boxes$362 to $372: 1 in 1,316 boxes$372 to $382: 1 in 1,538 boxes$382 or more: 2 of 100 boxes
Each bar covers $10 of box value. Bars right of the line are boxes worth at least what you paid.
Show as a table
Box valueBoxes out of 100Result
Under $222 of 100Lose money
$22 to $3216 of 100Lose money
$32 to $4224 of 100Lose money
$42 to $5218 of 100Lose money
$52 to $6211 of 100Lose money
$62 to $726 of 100Lose money
$72 to $823 of 100Lose money
$82 to $921 in 88Lose money
$92 to $1021 in 222Lose money
$102 to $1121 in 606Lose money
$112 to $1221 in 1,562Lose money
$122 to $1321 in 1,887Lose money
$132 to $1421 in 303Lose money
$142 to $1521 in 179Lose money
$152 to $1621 in 246Lose money
$162 to $1721 in 418Make money
$172 to $1821 in 746Make money
$182 to $1921 in 274Make money
$192 to $2021 in 96Make money
$202 to $2121 in 92Make money
$212 to $2221 in 116Make money
$222 to $2321 in 108Make money
$232 to $2421 in 142Make money
$242 to $2521 in 260Make money
$252 to $2621 in 299Make money
$262 to $2721 in 174Make money
$272 to $2821 in 122Make money
$282 to $2921 in 105Make money
$292 to $3021 in 90Make money
$302 to $3122 of 100Make money
$312 to $3222 of 100Make money
$322 to $3321 in 83Make money
$332 to $3421 in 155Make money
$342 to $3521 in 295Make money
$352 to $3621 in 633Make money
$362 to $3721 in 1,316Make money
$372 to $3821 in 1,538Make money
$382 or more2 of 100Make money

Where the value comes from

The average box, split by card type. Most of the value often sits in cards you'll rarely see.

Card typeHow many per boxAverage card after selling costsAdds to the box
Alt-art parallel (★ / ★★)1.1 per box1.1 per box$52.82$55
Common / Uncommon176 per box176 per box$0.08$15
Super Rare6.0 per box6.0 per box$2.02$12
Rare8.9 per box8.9 per box$0.62$5.52
Total$88

Chance of a big pull

How often a box has at least one of the rarest cards.

Show as a table
Card typeBoxes with at least oneOn averageBoxes for one specific card
Alt-art parallel (★ / ★★)Star-marked alternate-art versions of the set's cards, about one per box.66 of 1001.1 per box45

If card prices fall

Prices often drop in the weeks after a set comes out. This is the same box with cheaper cards and the same box price.

Card pricesCards inside, after costsCompared with the boxBoxes that lose moneyVerdict
Today's prices$88−$7483 of 100Keep it sealed
25% lower$64−$9886 of 100Keep it sealed
50% lower$38−$12498 of 100Keep it sealed
75% lower$17−$145more than 99 of 100 boxesKeep it sealed

Pull rates we used

Where each number comes from, and how sure we are. Sources checked on 14 October 2026. This box's own pull rates haven't been measured, so these come from boxes with the same pack layout, with extra uncertainty added.

Card typeHow oftenLikely rangeBased on
Common slots, 11 per pack
Common / Uncommon176 per boxPack layout
Rare-or-better slots, 1 per pack
Alt-art parallel (★ / ★★)1.1 per box1 in 2.2 boxes to 2.4 per boxEstimate, TCGTalk, Inuyasha (UE23BT) Union Arena guide: pull rates from 3 English boxes (48 packs)
Super Rare6.0 per box3.6 to 10.0 per boxEstimate, TCGTalk, Inuyasha (UE23BT) Union Arena guide: pull rates from 3 English boxes (48 packs)
Rare8.9 per boxThe rest of the slot

Most valuable cards

The 30 most valuable cards in the set, and what you'd keep after selling one.

CardCard typeTCGplayer priceAfter selling costs
Luminus (048) (SR**)Alt-art parallel (★ / ★★)$324.06$281.63
Hinata (034) (SR**)Alt-art parallel (★ / ★★)$323.96$281.55
Milim (085) (SR**)Alt-art parallel (★ / ★★)$311.07$270.33
Rimuru (044) (SR**)Alt-art parallel (★ / ★★)$292.68$254.33
Rimuru (107) (Box Topper Gold Foil)Alt-art parallel (★ / ★★)$273.01$237.22
Shuna (007) (SR**)Alt-art parallel (★ / ★★)$225.00$195.45
Benimaru (027) (SR**)Alt-art parallel (★ / ★★)$193.64$168.17
Shizu (043) (SR**)Alt-art parallel (★ / ★★)$192.00$166.74
Veldora (071) (SR**)Alt-art parallel (★ / ★★)$129.46$112.33
Rimuru (107) (SR*)Alt-art parallel (★ / ★★)$38.60$33.28
Rimuru (P-004) (R*)Alt-art parallel (★ / ★★)$37.13$32.00
Milim (083) (U*)Alt-art parallel (★ / ★★)$33.91$29.20
Soei (060) (SR*)Alt-art parallel (★ / ★★)$29.23$25.13
Milim (P-006) (R*)Alt-art parallel (★ / ★★)$27.88$23.96
Shion (P-005) (R*)Alt-art parallel (★ / ★★)$26.62$22.86
Milim (P-003) (R*)Alt-art parallel (★ / ★★)$23.41$20.07
Shion (019) (R*)Alt-art parallel (★ / ★★)$22.02$18.86
Luminus (047) (R*)Alt-art parallel (★ / ★★)$21.69$18.57
Shion (052) (R*)Alt-art parallel (★ / ★★)$21.69$18.57
Rimuru (052) (R*)Alt-art parallel (★ / ★★)$20.65$17.67
Shizu (P-002) (R*)Alt-art parallel (★ / ★★)$20.50$17.54
Rimuru (018) (SR*)Alt-art parallel (★ / ★★)$18.44$15.74
Hinata (033) (R*)Alt-art parallel (★ / ★★)$18.41$15.72
Milim (065) (U*)Alt-art parallel (★ / ★★)$17.76$15.15
Shion (056) (SR*)Alt-art parallel (★ / ★★)$16.99$14.48
Ramiris (088) (SR*)Alt-art parallel (★ / ★★)$16.68$14.21
Diablo (006) (SR*)Alt-art parallel (★ / ★★)$16.16$13.76
Milim (084) (R*)Alt-art parallel (★ / ★★)$15.58$13.25
Diablo (030) (SR*)Alt-art parallel (★ / ★★)$14.95$12.71
Rimuru (043) (U*)Alt-art parallel (★ / ★★)$13.02$11.03

How we work this out

We price every card at its TCGplayer market value, take off the selling costs above, and open 100,000 virtual boxes slot by slot using the pull rates in the table. The verdict compares the cards with the box price and checks how often a box loses money.

Read the full method