Teridius, Tidal Tyrant

Hexproof
Whenever another Kraken, Shark, or Fish you
control deals combat damage to a player or dies,
create a token that is a copy of that permanent
but it has Decayed and you gain 1 life.
Facedown creatures you control have
"{2}{w/u}{u/b}, exile this permanent: Return this
permanent from exile to the battlefield. Each
opponent loses 1 life".