Gura, Apex Pradetor

Whenever a creature dealt damage by Gura, Apex
Pradetor dies this turn, you may pay {g}{u}.
If you do, Consume. (Place that card under Gura,
Apex Pradetor. It gains the abilities, power and
toughness of all cards under it. When Gura, Apex
Pradetor is removed from the battlefield, all consumed
cards are returned to their owners graveyard.)
Sacrifice another Merfolk or Shark: Gura, Apex Pradetor gains indestrucable until end of turn