Valhrys, Drow Recluse

Reach, deathtouch
At the beginning of your upkeep, choose a card
at random in your graveyard and exile it. If it's a
creature card, put X +1/+1 counters on Valhrys,
Drow Recluse where X is that creature's power.
If it's an instant or sorcery card, you may cast it,
for as long as it remains exiled, without paying
its mana cost and, when you do, you lose life
equal to its converted mana cost.