A Magic booster case is 6 boxes, 36 packs each, 216 packs total. That's roughly 216 rare-slot cards and 24 mythics, plus foils, borderless treatments, and whatever special-treatment slot the current set introduced. Splitting one of these is a bigger operation than a single box — but the math is the same and Case Split scales fine.
Setting up rarities for Magic
The base rarities are stable across every Magic set:
- Common: 0.3
- Uncommon: 0.5
- Rare: 1.0
- Mythic Rare: 1.7
Modern sets add treatments that matter more than the base rarity: borderless, extended-art, showcase frames, retro frames, and set-specific bonus sheets. Handle those in one of two ways.
Option A: extra rarity rows
Add extra rows for the treatment tiers your group cares about. For a set like Bloomburrow you might add:
- Borderless Rare: 1.5
- Borderless Mythic: 2.2
- Special Guest: 2.5
This is simple and everyone-in-the-room can see the split at a glance. It's the right approach for sets where the special-treatment cards trade in a predictable range.
Option B: fixed cost for the actual chase
For sets with a small number of true chase cards — a Serialized card, a Confetti Foil One Ring, or the odd Special Guest that's worth $200 — put those on the fixed-cost line at their real market price. Everything else stays weighted.
Most Magic case splits end up mixing both approaches: broad treatment tiers as extra rarity rows for the average lift, and 1–3 specific chase pulls on fixed cost.
Foils
Whether to weight foils separately depends on the set. In a set like Modern Horizons 3, foils meaningfully bump value across the board and it's worth having a Foil Rare / Foil Mythic row. In a Standard-legal set, a foil common isn't distinguishable enough from a non-foil common to justify the extra row. Pick before you open the case.
Handling packs collectively
Some groups don't want to log every single common. That's fine — set common and uncommon to weight 0 and skip them entirely. You're then splitting the case cost purely on rares, mythics, and treatments. The math still balances because unlogged 0-weight cards don't contribute either way.
You can split a Magic case with 30 tracked cards or 300. Case Split doesn't care — pick the level of detail your group has the patience for.
A note on Collector Boosters
Collector Booster boxes are almost pure treatment cards, which changes the weight distribution completely — practically everything is a rare-or-better with some treatment applied. If you're splitting a Collector case, drop common and uncommon rows entirely, keep Rare/Mythic as baseline, and let borderless, extended-art, and foil treatments drive the split. Chase Serialized pulls should always be fixed cost.
Payment mechanics
Case Split shows the final amount per person. Payment happens outside the app — Venmo, Zelle, cash, store credit at your LGS, whatever your group uses. Screenshot the Split panel before you close the case so you have a record everyone can refer to later.