Thassa's Oracle

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Thassa's Oracle is THE premier blue combo-win condition: when its ETB resolves with an empty (or near-empty) library, it wins the game outright. It pairs with Demonic Consultation, Tainted Pact, Jace, Wielder of Mysteries, and Doomsday as the central line in cEDH. Its {U}{U} cost contributes to devotion and is a Game Changer — firmly a bracket 4–5 card. Outside combo shells it offers minimal value (a weak scry-like effect), making it a trap in non-combo decks.

• Thassa's Oracle wins on ETB resolution even if it is removed in response — the triggered ability checks library size when it resolves, not when it enters, so killing the Oracle after the trigger is on the stack does not stop the win if devotion >= library size.

  tagging · claude-sonnet-4-6

• The most common cEDH line is Demonic Consultation (naming an absent card) or Tainted Pact to exile the entire library, then casting Thassa's Oracle; the Oracle's ETB sees zero cards in library and devotion of at least 2, winning immediately.

  tagging · claude-sonnet-4-6

• Because the win condition is an ETB trigger, it can be countered (e.g. Stifle) or the Oracle can be bounced before the trigger resolves to deny the win — these are the primary interaction points at high-level tables.

  tagging · claude-sonnet-4-6

• Brawl (1v1) eval, NOT cEDH/Commander: a combo win-con that is WEAKER in Brawl than in cEDH: its best enablers are unavailable (Tainted Pact is banned, Demonic Consultation is not on Arena), so there is no clean way to empty the library. Outside a purpose-built deck it is just a 1/3 filter — skip.

  user · human

• EDHREC rank: #407
• Game changer: yes