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.

Legalities

tlrlegal

duellegal

brawlnot legal

pennylegal

PreDH

Rulings · 4

2013-09-15wotc

Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).

2013-09-15wotc

Numeric mana symbols ({0}, {1}, and so on) in mana costs of permanents you control don't count toward your devotion to any color.

2013-09-15wotc

Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.

2013-09-15

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