Thassa's Rebuff {1}{U}

Instant

Counter target spell unless its controller pays {X}, where X is your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)

To resist Thassa is to deny the rising tide.

Illustrated by Lucas Graciano

Standard
Brawl
Pioneer
Historic
Modern
Pauper
Legacy
Penny
Vintage
Commander