Mewtwo, Psychic Master

If this creature destroys another creature,
transform it into Mega Mewtwo X.
If this creature is used to counter a spell with a
converted mana cost of 4 or more, transform it
into Mega Mewtwo Y.
This creature does not take damage from being
blocked and cannot have its controller changed.
{1}{u}{b}{b}{b}: Exile target creature.
{u}{u}: Redirect or cancel target non-creature spell.