Astral Projection

If you are dealt damage, exile that many cards
from the top of your library and return Astral
Projection to its owner's hand at end of turn.
You can't cast spells. You can't draw cards. At
the end of each turn, reveal a card you own from outside the game and put it into your hand.
{2}{u}: Astral Projection deals 4 damage to any
target and 2 damage to you. Use this ability only
once a turn.