Cess'Taless, Wave of Tragedy

Updated 3 months ago.

"The shores were safe. Year upon year we were safe. She left, but always came back when most needed. But one day, she came back different."

We made a merfolk wizard ready to curse and loot and sacrifice and probably party.

This week's mechanic:
Offering: (You may cast this card any time you could cast an instant by sacrificing a [Subtype] and paying the difference in mana costs between this and the sacrificed [Subtype]. Mana cost includes color.)