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Thassa's Oracle

{U}{U}

Creature — Merfolk Wizard

MB2Mystery Booster 2#175rare
Game Changer
Banned in Duel CommanderBanned in HistoricBanned in Tiny Leaders
Finishes
Nonfoil · Foil
Border
black
Frame
future
Pull rate
~1 in 123–2533
Illustrator
Jesper Ejsing
Found in
Mystery Booster 2 Booster Pack
Printings7Combos96EDHREC rank#430
CommanderLegalModernLegalStandardNot legal
Format legality

Constructed

StandardNot legal
PioneerLegal
ModernLegal
LegacyLegal
VintageLegal
PauperNot legal

Commander

CommanderLegal
Pauper CommanderNot legal
Duel CommanderBanned
PreDHNot legal
OathbreakerLegal
Tiny LeadersBanned

Arena

AlchemyNot legal
HistoricBanned
TimelessLegal
BrawlLegal
Standard BrawlNot legal
Competitive BrawlLegal
GladiatorLegal

Other

PremodernNot legal
Old SchoolNot legal
Penny DreadfulNot legal
Future StandardNot legal
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 {U} in the mana costs of permanents you control counts toward your devotion to blue.)
1/3
Plays as:
Devotion PayoffLibrary ManipulationAlternate Win
Market · per finishspark updated 24h ago · prices as of 2026-08-29
Nonfoil-8.6%
$19.67
$19.19 low$5.19 gapTCGplayer
Foil+1.9%
$88.87
$84.70 low$29.70 gapTCGplayer
Cheapest playable copy$19.67· across 7 printings· you're viewing it

Rulings

6 · latest Jan 24, 2020
  • WotCJan 24, 2020

    Colorless and generic mana symbols ({C}, {0}, {1}, {2}, {X}, 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.