Karkanor, Sea Giant

(Karkanor, Sea Giant is also a Kraken, Leviathan, Octopus, and Serpent.)
Islandwalk, hexproof
Karkanor, Sea Giant and other Kraken,
Leviathan, Octopus, and Serpent spells you cast
cost {2} less to cast for each creature you control
with converted mana cost 4 or greater.
Other creatures with the same type as Karkanor
get +2/+2 and have islandwalk.