Emrakul, the Constelation

Trample, Indestructible, Flying, Protection from Creatures
When Emrakul attacks a player that player may
chose a planeswalker they control if they do
Emrakul attacks that planeswalker instead.
Whenever a planeswalker an opponent controls
loses loyality counters that planeswalkers
controller exiles that many cards from the top of
their libraries.