MTG Wiki
Keyword Ability
Type Static
Introduced Dragon's Maze
Last Used Dragon's Maze
Reminder Text Fuse (You may cast one or both halves of this card from your hand.)
30 split cards/
15 whole cards
{W} 13.3% {U} 13.3% {B} 13.3% {R} 13.3% {G} 13.3% {M} 33.3%
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Fuse is a keyword featured on split cards from Dragon's Maze.[1]


From the glossary of the Comprehensive Rules (November 19, 2021—Innistrad: Crimson Vow)

A keyword ability that allows a player to cast both halves of a split card. See rule 702.102, “Fuse.”

From the Comprehensive Rules (November 19, 2021—Innistrad: Crimson Vow)

  • 702.102. Fuse
    • 702.102a Fuse is a static ability found on some split cards (see rule 709, “Split Cards”) that applies while the card with fuse is in a player’s hand. If a player casts a split card with fuse from their hand, the player may choose to cast both halves of that split card rather than choose one half. This choice is made before putting the split card with fuse onto the stack. The resulting spell is a fused split spell.
    • 702.102b A fused split spell has the combined characteristics of its two halves. (See rule 709.4.)
    • 702.102c The total cost of a fused split spell includes the mana cost of each half.
    • 702.102d As a fused split spell resolves, the controller of the spell follows the instructions of the left half and then follows the instructions of the right half.

From the glossary of the Comprehensive Rules (November 19, 2021—Innistrad: Crimson Vow)

Fused Split Spell
A split card on the stack that has been cast using the fuse ability or a copy of such a card. See rule 702.102, “Fuse.”


Any time you could cast a split card with fuse, you can choose one half and cast it, just like any other split card. If you're casting it from your hand, you have the additional option to cast both halves as a single spell by paying their combined cost. Instructions on the left half are processed first, then the instructions on the right, and targets for the two halves are chosen separately.[2]

  • If you're casting a split card with fuse from any zone other than your hand, you can't cast both halves. You'll only be able to cast one half or the other.
  • To cast a fused split spell, pay both of its mana costs. For example, Down // Dirty has mana costs of {3}{B} and {2}{G}. To cast both halves, you pay {5}{B}{G}. While the spell is on the stack, its converted mana cost is 7.
  • You can choose the same object as the target of each half of a fused split spell, if appropriate. For example, if both the left and right halves of a split card require a "target creature," you can choose the same creature for each instance of the word target (but you don't have to).
  • When resolving a fused split spell with multiple targets, treat it as you would any spell with multiple targets. If all targets are illegal when the spell tries to resolve, the spell is countered and none of its effects happen. If at least one target is still legal at that time, the spell resolves, but an illegal target can't perform any actions or have any actions performed on it.
  • When a fused split spell resolves, follow the instructions of the left half first, then the instructions on the right half.
  • In every zone except the stack, split cards have one characteristic and one converted mana cost. If anything needs information about a split card not on the stack, it will get one combined value. For example, if a player reveals Down // Dirty due to Duskmantle Seer’s ability ("At the beginning of your upkeep, each player reveals the top card of their library, loses life equal to that card’s converted mana cost, then puts it into their hand."), the game will see its converted mana cost as 7. This translates to that player losing a total of 7 life.
  • On the stack, a split spell that hasn't been fused has only that half's characteristics and converted mana cost. The other half is treated as though it didn't exist.
  • Some split cards with fuse have two monocolor halves of different colors. If such a card is cast as a fused split spell, the resulting spell is multicolored. If only one half is cast, the spell is the color of that half. While not on the stack, such a card is multicolored.
  • Some split cards with fuse have two halves that are both multicolored. That card is multicolored no matter which half is cast, or if both halves are cast. It's also multicolored while not on the stack.
  • If a player names a card, the player may name either half of a split card, but not both. A split card has the chosen name if one of its two names matches the chosen name. This is a recent rules change.
  • If you cast a split card with fuse from your hand without paying its mana cost, you can choose to use its fuse ability and cast both halves without paying their mana costs.


  1. Mark Rosewater (April 15, 2013). "A Maze-ing Grace, Part 2". Wizards of the Coast.
  2. Wizards of the Coast (April 8, 2013). "The Mechanics of Dragon's Maze". Wizards of the Coast.