Calpurnia, Queen of Kelp

When Calpurnia, Queen of Kelp, enters the battlefield, the battlefield becomes flooded until
your next turn.
Whenever you cast a noncreature spell while the battlefield is flooded, return target creature with converted mana cost less than or equal to that of
the cast spell from a graveyard to the battlefield
under your control.
"The tides will take all."