Urza's Engine

Trample {3}: This creature gains banding until end of turn. (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 blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among

any of the creatures it's being blocked by or is blocking.) {3}: Attacking creatures banded with this creature gain trample until end of turn.

From Magic: The Gathering.

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