Gojira

When placed onto the battlefield, each opponent
must sacrifice 2 permanents.
Trample, Annihilator 2
Whenever Gojira attacks flip two coins.
If both are heads, Gojira must attack its controller.
If both are tails, or Gojira is destroyed or exiled,
shuffle Gojira into its owner's library.

"Say hello to my little friend..."