Chosen of the Deep

Chosen of the Deep gets +1/+1 for each Kraken, Leviathan, Octopus, Serpent and Whale you control.
{t}: Add {u}{u}. Only spend this mana to cast Kraken, Leviathan, Octopus, Serpent and Whale creatures.
Whenever you cast a Kraken, Leviathan, Octopus, Serpent and Whale, gain life equal to Chosen of the Deep's toughness.