Vassafina

Shroud, trample
{x}{2}{u}: Phase out Vassafina with X time
counters on it, and exile X cards divided among
any number of nonland permanents you control
and/or top cards from any player's library. Those
cards remain exiled as long as Vassafina is phased
out. When this creature phases in, return all
cards exiled with Vassafina to the battlefield
under your control.