Thassa, God of the Sea {2}{U}
Legendary Enchantment Creature — God
BlueCommander: legal
Identity
Blue
EDHREC rank
#1,969
Cheapest printing
US$4.58
TCGplayer
Printings
3
Indestructible
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.
{1}{U}: Target creature you control can't be blocked this turn.
Keywords: indestructible, scry
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.