Delvefall
Migratory Greathorn

Migratory Greathorn {3}{G}

Creature — Beast

Mutate {2}{G} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

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Sawtusk Demolisher
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"Mutate {3}{G}"