Teval, Arbiter of Virtue (Promo Pack) [Tarkir: Dragonstorm Promos]

Cost: 2 B G U Flying, lifelink
Spells you cast have delve. (Each card you exile from your graveyard while casting those spells pays for 1.)
Whenever you cast a spell, you lose life equal to its mana value. "As you act, so shall you be judged."