Sword of Hours {2}
Artifact — Equipment
Whenever equipped creature attacks, put a +1/+1 counter on it.
Whenever equipped creature deals combat damage, roll a d12. If the result is greater than the damage dealt or the result is 12, double the number of +1/+1 counters on that creature.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)
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Cards that do something similar expected a card that isn't here?
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Armory of Iroas 100%
$0.21#7824
"Whenever equipped creature attacks, put a +1/+1 counter on it."
+1 more matching line
Gleam of Battle 81%
$0.14#13144
"Whenever a creature you control attacks, put a +1/+1 counter on it."