Nyarlathotep

Devoid, Deathtouch
When Nyarlathotep enters the battlefield or
attacks, choose target opponent. Exile a random creature card from that player's graveyard.
At the beginning of your end step, choose up to
one creature card from among cards in exile. Nyarlathotep becomes a copy of that creature
except it's still 4/4 and it retains its other abilities.