Palkia

Spacial Rend: Whenever Palkia attacks, you
may exile it and a target creature defender
player controls into the Space-Time Rift. In
your next combat step, return Palkia to the
battlefield under your control tapped and
attacking.
Whenever Palkia and Dialga are exiled at the
same time, roll a six-sided die. With a 2 or less,
the Cataclysm begins.