Billy Bastion, SHAZAM

At the beginning of your end step, you may revel this card from your hand. If you do, create a 0/1 white legendary human creature token named Billy Bastion.
Flying, flash, indestructible
SHAZAM (When this enters the battlefield, sacrifice it unless you exile a creature named Billy Bastion under your control. When this leaves the battlefield, create a 0/1 white legendary human creature token named Billy Bastion)