Own one copy of each card. Mark your sleeves to show which decks it belongs to. Fan, pull, play.
How It Works
Import your decks
Paste deck URLs from Moxfield or Archidekt, or type them in manually. Each deck gets a unique color and stripe position. Up to 32 decks per PRISM.
See your shared cards
PRISM finds every card that appears in two or more decks. One Sol Ring across all 32.
Mark your sleeves
Export a printable marking guide. Use paint pens and the Spirit Guide tool to mark each sleeve edge. Fan your cards to find any deck instantly.
Features
Paste deck URLs or type lists in standard MTGO format. PRISM handles parsing, deduplication, and organization.
Each deck gets a unique color and a fixed stripe position. Fan your cards, look at one position, pull that deck's cards.
Add a new deck later? PRISM shows what changed so you only mark new cards. No re-marking hundreds of sleeves.
Download your marking guide as CSV, JSON, or a printable reference. Print it, share it, bring it to the table.
Your PRISMs save locally in your browser. Come back anytime to update or export.
Each PRISM supports 32 decks with unique stripe positions. Larger collections can use multiple PRISMs.
Your collection, organized.
Stop buying duplicates. Start sharing cards across decks with confidence.
Frequently Asked Questions
Basics aren't singleton, so PRISM tracks the maximum quantity you need across all decks. If Deck A needs 12 Islands and Deck B needs 5, you need 12 total. All 12 get Deck A's mark. 8 of them also get Deck B's mark. The "Basics by Deck" filter shows the exact count for each deck.
Paint pens work best on most sleeves. Look for fine-tip acrylic paint pens in a variety of colors. PRISM defaults to colors that match standard paint pen sets. See the Tools page for specific recommendations.
Sell them. Once your sleeves are marked, you only need one copy of each card. Your duplicates become trade fodder or cash. Many players recoup the cost of their marking supplies by selling extras.
Each PRISM supports 32 decks. For larger collections, create multiple PRISMs. You might organize them by color identity, power level, or sleeve color.
All PRISM data is stored locally in your browser. Nothing is sent to any server. You can export your data as JSON anytime for backup or to move between devices.
Yes. Use the Move button on each deck card to open the visual slot picker, or use the Export tab's dropdown list for bulk reordering. Helpful if you want to group decks by color identity or put your most-played decks in easy-to-spot 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. Sleeve edge marks don't add noticeable thickness or affect the card's profile in the deck. If you have to look at it from a specific angle to notice anything, it's fine.