Hormagaunt

Mutate
(Whenever you cast a non creature spell or any
opponent casts a spell, you may select one creature
with Mutate. That creature gains one of the following options whilst it is on the battlefield: a +1/+1 Counter,
First Strike, Haste, Intimidate, Lifelink, Reach or Vigilance.
Each creature may only Mutate once per instance of Mutate, and cannot be chosen to Mutate if
all of its instances of Mutate have been applied to it,
unless stated otherwise)