Eluge, the Shoreless Sea is a mythic Legendary Creature — Elemental Fish card from Bloomburrow Promos (PBLB), collector number 49s. Current market price: — (foil $14.62), TCGplayer market prices via Scryfall.
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.