Share MTG Commander cards across multiple decks without buying duplicates. Mark your sleeves once, swap cards in seconds.
How It Works
Import Your Decks
Paste your decklists (up to 32 decks). Each deck gets a unique color and stripe position.
See Shared Cards
PRISM finds cards that appear in multiple decks. One Sol Ring can serve all 32!
Mark Your Sleeves
Export a guide showing exactly where to mark each sleeve. Fan cards to find any deck instantly.
Features
Paste decklists in standard MTGO/Moxfield format. PRISM handles parsing, deduplication, and organization automatically.
Each deck gets a unique color and fixed position. Fan your cards and look at one stripe to find a specific deck's cards.
Add new decks later? PRISM shows what changed so you only mark new cards—no need to re-mark hundreds of sleeves!
Download your marking guide as CSV or JSON. Print it, share it, or import into other tools.
Your PRISMs are saved locally in your browser. Come back anytime to update or export.
Each PRISM supports up to 32 decks with unique stripe positions. For larger collections, create multiple PRISMs.
Ready to unleash your collection?
Stop buying duplicate staples. Start sharing cards across decks with confidence.
Frequently Asked Questions
Basic lands don't follow the singleton rule, so PRISM handles them specially. It tracks the maximum quantity you need across all decks. If Deck A needs 12 Islands and Deck B needs 5, you need 12 Islands total—all marked for both decks.
Paint pens work great on most sleeves! Look for fine-tip acrylic paint pens in a variety of colors. PRISM defaults to basic colors (Red, Blue, Green, Yellow, etc.) that match standard paint pen sets.
Sell them! Once you've marked your sleeves, you only need ONE copy of each card. Your duplicates become trade fodder or cash. Many players recoup the cost of their marking supplies (and then some) by selling extras.
Each PRISM supports up to 32 decks. For larger collections, create multiple PRISMs! You might organize by color identity, power level, or use different sleeve colors for each PRISM group.
All your PRISM data is stored locally in your browser's localStorage. Nothing is sent to any server. You can export your data as JSON anytime for backup or to transfer between devices.
Yes! After adding your decks, you can drag-and-drop to reorder stripe positions. This is helpful if you want to group decks by color identity or put your most-played decks in easy-to-see positions.
Yes! According to MTR 3.12, cards are only considered "marked" if the marking makes it possible to identify the card without seeing its face. Since sleeve markers don't add noticeable thickness and don't affect the card's profile in the deck, they're perfectly legal. Cards must stand out when in the deck to be considered marked—if you have to look at it from funny angles to notice anything, it's fine.