Lolth, Queen Of Reaped Beasts

Mutate (If you cast this spell by paying its mutate cost, place it over or under the target non-Human creature you control. They mutate into the creature on top plus all the abilities below.)
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Control over Sea Beasts (Whenever an opponent plays a Beast card, you may pay {g/u} {g/u}. If you do, you gain control of that creature, and Lolth becomes unblockable until the end of the combat phase.)

{g}{g}: Lolth, Queen Of