Share MTG Commander cards across multiple decks without buying duplicates. Mark your sleeves once, swap cards in seconds.
Commander players often own 5-30+ decks, and staples like Sol Ring, Mana Crypt, and Command Tower appear in almost every one. You can:
- Buy duplicates — expensive, wasteful
- Use proxies — not tournament legal
- Re-sleeve constantly — slow and annoying
PRISM assigns each deck a unique color and stripe position. Mark your sleeves with paint pens, and any card can live in multiple decks. Fan your cards to instantly see which decks a card belongs to.
One Sol Ring. One Mana Crypt. Up to 32 decks.
- Import — Paste your decklists (MTGO/Moxfield format)
- Assign — Each deck gets a color + stripe position (1-32)
- Analyze — PRISM finds shared cards across decks
- Export — Download your marking guide (CSV, JSON, or printable)
- Mark — Apply colored stripes to sleeve edges with paint pens
- Up to 32 decks per PRISM
- Smart basic land handling — calculates max needed, not sum
- Track changes — add decks later, only mark new cards
- Multiple export formats — CSV, JSON, printable guide
- Auto-save — localStorage persistence, no account needed
- Reorder stripes — drag-and-drop to customize positions
- 100% client-side — your data never leaves your browser
Yes! Per MTR 3.12, cards are only "marked" if identifiable without seeing the face. Sleeve edge marks don't affect the card's profile in the deck.
Based on average EDHREC decklists for top commanders:
| Collection | Sellable Duplicates | Resale Value |
|---|---|---|
| 5 decks | 166 cards | ~$919 |
| 10 decks | 358 cards | ~$1,637 |
| 32 decks | 1,530 cards | ~$6,453 |
Sell your duplicates. Fund more decks. 💰
Contributions welcome! This is a community tool built for Commander players.
- Bug reports — Open an issue
- Feature ideas — Open an issue or discussion
- Pull requests — Fork, branch, PR
- Vanilla JavaScript (ES6 modules)
- Web Awesome components
- localStorage for persistence
- Hosted on Netlify
MIT — Use it, fork it, build on it.
Made for Commander players, by Commander players
prismmtg.netlify.app