Demissus, the Insatiable

While attacking, if defending player controls an island, Demissus has hexproof.
{6}{u}: Put a devour counter on target creature
you control. At the end of your next turn,
sacrifice that creature.
As long as you control a creature with a devour
counter on it, any spell or damage that would
destroy Demissus, destroys the creature with the
devour counter instead.