Rakshasa offer deals that sound advantageous to those who forget who they are dealing with.

Rakshasa Vizier

Whenever one or more cards are put into exile from your graveyard, put that many +1/+1 counters on this creature.

Khans of Tarkir

Magic Online Promos

Khans of Tarkir Promos

Whenever one or more cards are put into exile from your graveyard, put that many +1/+1 counters on Rakshasa Vizier.

Exiling cards from your graveyard to pay the cost of a spell with delve is a single action. It will cause Rakshasa Vizier’s ability to trigger once, putting a number of +1/+1 counters on it equal to the number of cards you exiled.

If a card is exiled “instead” of being put into a graveyard, Rakshasa Vizier’s ability won’t trigger.