Desperate Gambit

Instant    (CMC:1)

Flip a coin; target opponent calls heads or tails while coin is in the air. If the flip ends up in your favor, double the damage dealt by a source you control. Otherwise, prevent all damage from that source.

WL • ENPete Venters

™ & © 1993—1997 Wizards of the Coast

Legal in: Mirage Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Desperate Gambit {R} Instant Choose a source you control and flip a coin. If you win the flip, the next time that source would deal damage this turn, it deals double that damage instead. If you lose the flip, the next time it would deal damage this turn, prevent that damage.

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10/4/2004
The coin is flipped during resolution of this spell, so you know in advance what will happen when the source deals damage the next time.
4/1/2008
The chosen source may be a permanent, a spell on the stack, or anything referred to by something on the stack (such as a Prodigal Pyromancer that's left the battlefield while its ability is still on the stack)

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Card Desperate Gambit is not on TCGPlayer.