Battering Ram 
Artifact Creature — Construct
At the beginning of combat on your turn, this creature gains banding until end of combat. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's blocking.)
Whenever this creature becomes blocked by a Wall, destroy that Wall at end of combat.
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Cards that do something similar expected a card that isn't here?
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"Whenever this creature becomes blocked by a non-Wall creature, destroy that creature at end of combat."
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