Eluge, the Shoreless Sea (M 288 BLB Foil)

Eluge's power and toughness are each equal to the number of Islands you control.
Whenever Eluge enters or attacks, put a flood counter on target land. It's an Island in addition to its other types for as long as it has a flood counter on it.
The first instant or sorcery spell you cast each turn costs {U} (or {1}) less to cast for each land you control with a flood counter on it.

mythic
Legendary Creature — Elemental Fish
From the Magic: The Gathering set Bloomburrow.