Disharmony 

Instant
Cast this spell only during combat before blockers are declared.
Untap target attacking creature and remove it from combat. Gain control of that creature until end of turn.
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Cards that do something similar expected a card that isn't here?
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Melee 94%
$0.33#28941
"Cast this spell only during combat on your turn before blockers are declared."
+1 more matching line
Illusionist's Gambit 90%
$0.44#3736
"Cast this spell only during the declare blockers step on an opponent's turn."
+1 more matching line
Berserker's Frenzy 87%
$1.45#6973
"Cast this spell only before combat or during combat before blockers are declared."