Eluge, the Shoreless Sea

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.

From Magic: The Gathering.

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