Desperate Gambit 
Instant
$0.59 #12077 0.17 29.2 years
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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Cards similar to Desperate Gambit expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Impulsive Maneuvers83%
$4.03↑#107330.35↑24.9 years↓
"Whenever a creature attacks, flip a coin. If you win the flip, the next time that creature would deal combat damage this turn, it deals double that damage instead. If you lose the flip, the next time that creature would deal combat damage this turn, prevent that damage."
Bitter Feud76%
$0.51↓#15138↓0.1311.8 years↓
"If a source controlled by one of the chosen players would deal damage to the other chosen player or a permanent that player controls, that source deals double that damage to that player or permanent instead."
Goldnight Castigator72%
$0.55↓#121850.43↑10.4 years↓
"If a source would deal damage to this creature, it deals double that damage to this creature instead."
Sawhorn Nemesis72%
$0.40↓#6536↑0.43↑2.2 years↓
"If a source would deal damage to the chosen player or a permanent they control, it deals double that damage instead."
Reflect Damage72%
$3.52↑#20293↓0.1429.9 years
"The next time a source of your choice would deal damage this turn, that damage is dealt to that source's controller instead."
Twinflame Tyrant72%
$24.81↑#802↑0.79↑1.8 years↓
"If a source you control would deal damage to an opponent or a permanent an opponent controls, it deals double that damage instead."
Fiery Emancipation72%
$7.77↑#855↑0.79↑6.2 years↓
"If a source you control would deal damage to a permanent or player, it deals triple that damage to that permanent or player instead."
Angrath's Marauders72%
$0.33↓#2550↑0.40↑8.9 years↓
"If a source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead."
Absorbing Man and Titania71%
$2.34↑#16279↓0.00↓0.2 years↓
"Double all damage that creature sources you control would deal."
Gratuitous Violence71%
$0.38↓#1513↑0.46↑23.9 years↓
"If a creature you control would deal damage to a permanent or player, it deals double that damage instead."
Charging Tuskodon71%
$0.13↓#15971↓0.43↑8.6 years↓
"If this creature would deal combat damage to a player, it deals double that damage to that player instead."
Fiendish Duo70%
$1.71↑#3565↑0.39↑6.8 years↓
"If a source would deal damage to an opponent, it deals double that damage to that player instead."
Dictate of the Twin Gods70%
$1.21↑#2351↑0.59↑12.4 years↓
"If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead."