Isnix, Apex of Blasphemy

Mutation:{2}{w}{u}{b}{r}{g}
Deathtouch, menace
You may cast Isnix apex of blasphemy from your graveyard or exile for its mutate cost.

Whenever this creature mutates, choose graveyard or exile:
- You may cast a creature with mutate from there, only once per turn.
- When you cast it from the graveyard, you mill cards equal to its creature mana value.
- If you cast it from exile, exile cards from the bottom of your library equal to this creature mana value.