Mana Clash 
Sorcery
$0.92 #8209 0.25 32.1 years
You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players' coins come up heads on the same flip.
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Cards similar to Mana Clash expected a card that isn't here?
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Game of Chaos78%
$12.93↑#74660.76↑31.3 years
"Flip a coin. If you win the flip, you gain 1 life and target opponent loses 1 life, and you decide whether to flip again. If you lose the flip, you lose 1 life and that opponent gains 1 life, and that player decides whether to flip again. Double the life stakes with each flip."
Mutalith Vortex Beast72%
$0.63↓#97580.57↑3.9 years↓
"When this creature enters, flip a coin for each opponent you have. For each flip you win, draw a card. For each flip you lose, this creature deals 3 damage to that player."