
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.)
Thassa's Rebuff has 1 printing, first in Born of the Gods (2014). EDHREC ranks it #15,138 among Commander cards. It appears most in Svyelun of Sea and Sky decks (527 on EDHREC). It has 4 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.