Delvefall
Auspicious Starrix

Auspicious Starrix {4}{G}

Creature — Elk Beast

Mutate {5}{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, exile cards from the top of your library until you exile X permanent cards, where X is the number of times this creature has mutated. Put those permanent cards onto the battlefield.

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Cards that do something similar expected a card that isn't here?

Glowstone Recluse
Glowstone Recluse 99%
$0.18#7079
"Mutate {3}{G}"
+1 more matching line
Sawtusk Demolisher
Sawtusk Demolisher 99%
$3.13#6311
"Mutate {3}{G}"
Migratory Greathorn
Migratory Greathorn 99%
$0.27#5321
"Mutate {2}{G}"
+1 more matching line
Illuna, Apex of Wishes
Illuna, Apex of Wishes 90%
$0.76#9446
"Whenever this creature mutates, exile cards from the top of your library until you exile a nonland permanent card. Put that card onto the battlefield or into your hand."
+1 more matching line