Enchantment

Opal Acrolith

Opal Acrolith trading card
Enchantment1 exact printing

Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature. {0}: This permanent becomes an enchantment.

From Magic: The Gathering.

Exact printings

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ofl0db5b7pb1ht22hhzns.