Best Union Arena booster boxes to open right now

Every box we track, ranked by what its cards are worth after selling costs against today's box price. Updated October 15, 2026.

No Union Arena box is worth opening at today's prices. The closest is the Union Arena Attack on Titan Vol.2 booster box: $155€139 of cards after selling costs for a $79€70 box.

Every Union Arena box, ranked

#	Box	Verdict	Box price	Cards, after costs	Cards ÷ price	Boxes that lose money
1	Attack on Titan Vol.2 booster box	Toss-up	$79€70	$155€139	197%	66 of 100
2	INUYASHA booster box	Toss-up	$135€120	$172€154	128%	63 of 100
3	SAKAMOTO DAYS booster box	Toss-up	$94€84	$119€106	127%	71 of 100
4	CHAINSAW MAN booster box	Toss-up	$155€138	$153€136	99%	71 of 100
5	Re:ZERO -Starting Life in Another World- booster box	Toss-up	$100€89	$99€88	98%	75 of 100
6	Rurouni Kenshin booster box	Toss-up	$84€75	$80€71	95%	73 of 100
7	Evangelion: New Theatrical Edition booster box	Toss-up	$141€125	$131€117	93%	75 of 100
8	GODDESS OF VICTORY: NIKKE booster box	Keep it sealed	$76€68	$67€60	88%	77 of 100
9	Sword Art Online Vol.2 booster box	Keep it sealed	$109€97	$95€85	87%	70 of 100
10	The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You booster box	Keep it sealed	$156€139	$113€101	72%	83 of 100
11	CODE GEASS Lelouch of the Rebellion booster box	Keep it sealed	$92€82	$65€58	70%	73 of 100
12	Attack on Titan booster box	Keep it sealed	$111€99	$77€69	69%	78 of 100
13	Sword Art Online booster box	Keep it sealed	$158€141	$104€93	66%	77 of 100
14	Tokyo Ghoul series booster box	Keep it sealed	$141€125	$90€81	64%	81 of 100
15	BLEACH: Thousand-Year Blood War Vol.2 booster box	Keep it sealed	$160€142	$100€89	62%	83 of 100
16	Kaiju No. 8 booster box	Keep it sealed	$98€87	$61€54	62%	75 of 100
17	FULLMETAL ALCHEMIST booster box	Keep it sealed	$96€86	$56€50	58%	77 of 100
18	That Time I Got Reincarnated as a Slime booster box	Keep it sealed	$162€145	$88€78	54%	83 of 100
19	Yu Yu Hakusho: Ghost Files booster box	Keep it sealed	$70€63	$38€34	53%	84 of 100
20	CODE GEASS Lelouch of the Rebellion Vol.2 booster box	Keep it sealed	$61€54	$27€25	45%	86 of 100
21	HUNTER X HUNTER booster box	Keep it sealed	$161€144	$64€57	40%	85 of 100
22	Jujutsu Kaisen booster box	Keep it sealed	$136€121	$53€47	39%	84 of 100
23	ONE PUNCH MAN booster box	Keep it sealed	$160€143	$62€55	39%	86 of 100
24	SOLO LEVELING booster box	Keep it sealed	$256€228	$97€87	38%	90 of 100
25	BLEACH: Thousand-Year Blood War booster box	Keep it sealed	$169€150	$64€57	38%	88 of 100
26	KAGURABACHI booster box	Keep it sealed	$476€424	$169€150	35%	95 of 100
27	HUNTER X HUNTER Vol.2 booster box	Keep it sealed	$80€71	$23€20	28%	88 of 100
28	Demon Slayer: Kimetsu no Yaiba booster box	Keep it sealed	$291€260	$77€69	27%	94 of 100
29	JUJUTSU KAISEN Vol.2 booster box	Keep it sealed	$166€148	$44€39	26%	94 of 100
30	Black Clover booster box	Keep it sealed	$340€303	$90€80	26%	93 of 100

Toss-ups

Close to break-even, or only worth it if you land a big hit.

Union Arena Attack on Titan Vol.2 Toss-up $155€139 of cards for a $79€70 box 66 of 100 boxes lose money Released September 18, 2026. Estimated odds
Union Arena INUYASHA Toss-up $172€154 of cards for a $135€120 box 63 of 100 boxes lose money Released August 14, 2026
Union Arena SAKAMOTO DAYS Toss-up $119€106 of cards for a $94€84 box 71 of 100 boxes lose money Released May 29, 2026. Estimated odds
Union Arena CHAINSAW MAN Toss-up $153€136 of cards for a $155€138 box 71 of 100 boxes lose money Released July 31, 2026. Estimated odds
Union Arena Re:ZERO -Starting Life in Another World- Toss-up $99€88 of cards for a $100€89 box 75 of 100 boxes lose money Released September 18, 2026. Estimated odds
Union Arena Rurouni Kenshin Toss-up $80€71 of cards for a $84€75 box 73 of 100 boxes lose money Released September 26, 2025. Estimated odds

Keep these sealed

The least value inside for the price.

More rankings

Each box's cards are priced at today's market value, selling costs come off, and simulated boxes show how often one loses money. Read the full method