Xanthahar, Keeper of Andlang

Xanthahar enters the battlefield with a number
of +1/+1 counters equal to the number of all
cards in exile. Xanthahar has trample as long as
he has five or more counters on him.
{w/u}{w/u}: Exile Xanthahar, then return him to the battlefield tapped under his owner's control.
{g}{w}{u}: Target opponent reveals their hand. You choose a nonland card from it.
Exile that card.