Spiridius, Apex of Mist

Mutate {2}{w}{b}{g}(If you casts this spell for its
mutate cost, you may put it over or under target
non-human creature you control. They mutate
into the creature on top plus all the abilities from
under it. )
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When this creature mutates prevent all damage
that would be dealt to it until end of turn. Then
this creature deals damage to target creature
equal to the amount of damage dealt to this
creature this turn