Desperate Gambit
Mana cost
Mana value1TypeInstant
Color identity
Red
RarityUncommon
SetWeatherlight (WTH)
ArtistPete Venters
Price€0.72 · $0.59
Desperate Gambit 
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.
Legality
CommanderLegalStandardNot legalPioneerNot legalModernNot legalLegacyLegalVintageLegalPauperNot legalBrawlNot legalOathbreakerLegalHistoricNot legalTimelessNot legalPenny DreadfulNot legal
Rulings
2008-04-01
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)
2004-10-04
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.