Inkalizar, Gravepower Fiend

Deathtouch, Delve (Each card you exile from your graveyard while casting this spell pays for {1})

Whenever a creature card is put into your graveyard from anywhere, create a tapped treasure token and investigate.

{3}, Sacrifice three clue tokens: Exile up to three target creature cards from your graveyard. Until end of turn, you may cast those creatures without paying their mana costs. Whenever you cast a creature this way, you lose life equal to its mana value.