Xenothil, the First One

Trample
Whenever Xenothil would leave play, it is instead reshuffled into its owner's deck. This cannot be prevented by any means.
{x}, {g}{g}: Xenothil gains X +1/+1 counters.
"The first living thing in the universe. Before the gods, before the kings and queens, heroes and villains. Saying it's immortal would be an understatement- it can never die."