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.

Flying When this creature enters, draw a card, then discard a card.

Flying Whenever an artifact you control enters, you may draw a card. If you do, discard a card.

Whenever this creature attacks, target player mills half their library, rounded up.