Salinae, the Ocean Mother — Nauctis: The Sunken Realm #353

This spell costs less to cast, where X is your devotion to blue. (Each in the mana costs of permanents you control counts toward your devotion to blue.)

Trample

Whenever you cast an artifact or creature spell, copy it, except the copy is a 1/1 Fish creature in addition to its other types. (The copy becomes a token.)