Thassa's Oracle

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.)

CMC

Set

MB2

Rarity

rare

Price

$25.01

FORMATS

CommanderSTAPLE 2.9%

Brawl (Historic)STAPLE 1.8%

DraftNOT LEGAL

StandardNOT LEGAL

ModernLEGAL

PioneerSTAPLE 1.4%

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WWizards of the Coast2020-01-24
Official Ruling
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.
WWizards of the Coast2020-01-24
Official Ruling
Colorless and generic mana symbols (, , , , , and so on) in mana costs of permanents you control don't count toward your devotion to any color.
WWizards of the Coast2020-01-24
Official Ruling
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.
WWizards of the Coast2020-01-24
Official Ruling
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.
WWizards of the Coast2020-01-24
Official Ruling
Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
WWizards of the Coast2020-01-24
Official Ruling
Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.

Rulings via Scryfall

COMMENTS · 1

WO
Wizards of the Coast2021-05-19
Thassa's Oracle was banned in historic on May 19, 2021. While Thassa's Oracle is a powerful card that has created combo decks across multiple formats, with the recent printing of Tainted Pact and the fine-tuning of that archetype, we've seen the rise of the two-card combo in Historic to the point that half the field for the past League Weekend utilized the combo. Due to the power of the two-card combination, and because we expect that Thassa's Oracle is likely to cause problems down the road as Historic continues to add new cards, Thassa's Oracle is banned in Historic. Source: https://magic.wizards.com/en/news/news/may-19-2021-banned-and-restricted-announcement