Sawtusk Demolisher

Mutate {3}{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.)
Trample
Whenever this creature mutates, destroy target noncreature permanent. Its controller creates a 3/3 green Beast creature token.

Historic Anthology 4

Mutate {3}{G}
Trample
Whenever this creature mutates, destroy target noncreature permanent. Its controller creates a 3/3 green Beast creature token.

Commander 2020

If the target noncreature permanent is an illegal target by the time Sawtusk Demolisher’s last ability tries to resolve, the ability won’t resolve. No player will create a Beast token. If the target is legal but not destroyed (most likely because it has indestructible), its controller does create a Beast token.