Thassa's Oracle
Game ChangerTheros Beyond Death (THB)
Creature — Merfolk Wizard
When this creature enters, look at the top X cards of your library, where X is your devotion to blue. Put up to one of them on top of your library and the rest on the bottom of your library in a random order. If X is greater than or equal to the number of cards in your library, you win the game. (Each in the mana costs of permanents you control counts toward your devotion to blue.)Constructed
Commander
Arena
Other
Used in 96 known combosEDHREC #430
Versions
6 printings · from $19.76
Rulings
6 · latest Jan 24, 2020
- WotCJan 24, 2020
Colorless and generic mana symbols (
, 
, 
, 
, 
, and so on) in mana costs of permanents you control don't count toward your devotion to any color. - WotCJan 24, 2020
Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
- WotCJan 24, 2020
If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it's still on the battlefield at that time.
- WotCJan 24, 2020
If you put an Aura on an opponent's permanent, you still control the Aura, and mana symbols in its mana cost count towards your devotion.
- WotCJan 24, 2020
If your devotion to blue is zero at the time the triggered ability of Thassa's Oracle resolves, you don't look at or move any cards in your library. If you have no cards in your library, you win the game.
- WotCJan 24, 2020
Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.