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Union Arena— what's in the box

Snapshot as of 2026-07-23 · every rate carries its basis — estimates are estimates

Does the publisher tell you the odds?

No. Official NA product pages list only titles, dates and $4.99 pack MSRP; no configuration odds.

Union Arena

Pack anatomy

Cards per pack
8
Packs per box
16 (EN displays and most JP boxes; some JP releases shipped as 20-pack boxes, e.g. UA07BT per Amazon listing)
Boxes per case
not verified; community references 'case' hits without a documented box count

Guaranteed slots: 1 foil card per pack per community guides; no official slot documentation

The family outlier: smaller 8-card packs and 16-pack IP-licensed boxes (Jujutsu Kaisen, Hunter x Hunter, Demon Slayer, etc.). EN launched Sep 2024 with '1st edition' stamped printings. Same no-odds policy as the rest of the family.

Rarity ladder

  1. ·C (Common)
  2. ·U (Uncommon)
  3. ·R (Rare)
  4. ·SR (Super Rare)
  5. ·SR★ (1-star alt-art parallel)
  6. ·★★ (2-star premium parallel)
  7. ·★★★ (3-star top parallel, newer sets)
  8. ·AP (Action Point) foil versions — chase utility cards
  9. ·(some guides also list 'UR/Union Rare' and 'SP' tiers — terminology is inconsistent across sources; treat with caution)

Approximate rates

Confidence is part of the data: a low-confidence range is an honest answer, a precise-looking number without a basis is not.

SRlow confidence

~4 per 16-pack box

Basis: anecdote (single-collector reports quoted in community guides); no large-sample data found source →

1-star (★) parallellow confidence

~1 per box

Basis: anecdote/community consensus ('boxes reliably deliver starred cards') source →

AP foillow confidence

~1 per case

Basis: anecdote in community guide source →

2-star / 3-star parallelslow confidence

rarer than AP foils, i.e. sub-1-per-case; no sampled numbers exist publicly

Basis: anecdote in community guide source →

Rare occurrences — god packs, case hits, oddities

3-star (★★★) chase parallels

Top alt-art foil tier added in newer sets; functions as the set's case-hit-level chase

Approximate frequency: under 1 per case (anecdote, low confidence)

Sets: newer UA sets (2025+)

No god packs / no serialized cards

No god-pack or serialized mechanic documented for Union Arena in any source reviewed

Approximate frequency: n/a

Rates drift between sets, print waves, and regions; where our sources disagreed we kept the disagreement visible instead of averaging it away. Nothing on this page is investment or purchase advice — it exists so you know what a box is before you buy one.

Machine-readable twin: /api/v1/pulls · snapshot 2026-07-23