Forbidden Incantations

Pact — As an additional cost, you may gain any
number of debt counters, then pay 2 life for each
debt counter you have.
Cast a number of target instant or sorcery cards
in your graveyard up to the amount of debt
counters you have. Any cards cast this way that
would be put into your graveyard are exiled
instead. Exile Forbidden Incantations.
The grimoire held secrets both powerful and terrifying.