Zalgrim, Hoarder of Souls

Flying, deathtouch
Whenever a creature is put into your graveyard
from anywhere, you may exile it. If you do, put a
+1/+1 counter on Zalgrim and it deals 1 damage
to any target.
When Zalgrim dies, if you have 1 or fewer cards
in hand, shuffle Zalgrim and all cards exiled by it
into your library.