As long as your devotion to blue is less than five, Thassa isn't a creature. (Each U in the mana costs of permanents you control counts toward your devotion to blue.)
At the beginning of your upkeep, scry 1.
1U: Target creature you control can't be blocked this turn.
Near Mint - $1.200
Lightly Played - $900
Moderately Played - $800
Heavily Played - $700
Damaged - $600
Near Mint Spanish - $1.200
Lightly Played Spanish - $900
Moderately Played Spanish - $800
Heavily Played Spanish - $700
Damaged Spanish - $600