Impulsive Maneuvers 
Enchantment
$4.03 #10727 0.35 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.
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Cards similar to Impulsive Maneuvers 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.
Desperate Gambit83%
$0.59↓#120750.17↓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."
Goblin Psychopath75%
$0.15↓#22481↓0.00↓23.3 years↓
"Whenever this creature attacks or blocks, flip a coin. If you lose the flip, the next time it would deal combat damage this turn, it deals that damage to you instead."
Charging Tuskodon72%
$0.13↓#15969↓0.438.6 years↓
"If this creature would deal combat damage to a player, it deals double that damage to that player instead."
Dictate of the Twin Gods70%
$1.24↓#2350↑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."