What it does
Splice lets you reveal a card with splice from your hand while casting a spell of the matching type (usually Arcane), adding that card's text and paying its splice cost. The spell gains the extra effects, but the spliced card stays in your hand—it isn't cast and doesn't go to the graveyard. You can splice multiple cards onto one spell, stacking effects and costs.
The most common misunderstanding: the spliced card never leaves your hand, so you can reuse it again and again on future spells. Also, since you're only adding text to an existing spell, if that base spell is countered or fizzles, the spliced effects don't happen either—and the spliced card simply remains in hand.
In Commander, splice is niche, living almost entirely in the Arcane/Spirit tribal decks from Kamigawa. It shines when you have repeatable cheap Arcane spells to keep splicing onto, generating value over a long game.
Iconic cards with Splice
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