Avacyn's Tomb

Avacyn's Tomb enters the battlefield tapped.

{x}, {t}: Add X charge counters to Avacyn's Tomb.
Then you may search your library for an angel card
with mana value less than or equal to the number
of charge counters on Avacyn's Tomb, put it onto
the battlefield, then shuffle. If you do, sacrifice
Avacyn's Tomb. You lose life equal to the mana
value of that card.