Sphinx Mindbreaker
Creature — Sphinx
Flying
When this creature enters, each opponent mills ten cards.
- CMC
- 7
- Mana cost
- Color identity
- U
- Rarity
- rare
- Set
- Theros Beyond Death
- Price
- $1.31
- EDHREC rank
- #15386
Sphinx Mindbreaker enters the battlefield and immediately mills each opponent for ten cards — that's thirty cards gone at the table before it ever attacks. The Mindskinner tag means you're paying eight mana for a body that doubles as a win condition in dedicated mill builds, and that's a fair exchange if your deck can support the cost.
Best Commanders
Commanders with the highest synergy
The Mindskinner
The Mindskinner's ability triggers on combat damage and mills opponents, so Sphinx Mindbreaker's enters-the-battlefield mill acts as a free head start before you ever swing — running both in the same shell means you're applying mill pressure from two angles simultaneously.
Bruvac the Grandiloquent
Bruvac the Grandiloquent doubles every mill trigger, which means Sphinx Mindbreaker's ten-card ETB becomes twenty per opponent — sixty cards across a four-player table from a single cast.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Commander is where Sphinx Mindbreaker actually belongs: the ETB mill hits all opponents simultaneously, so the eight-mana cost is spread across three targets instead of one. In 60-card formats like Modern and Pioneer, eight mana is an enormous ask and dedicated mill has faster, cheaper options — Sphinx Mindbreaker doesn't see competitive play there. Legacy and Vintage have the same problem compounded by the presence of broken interaction; it's legal but irrelevant. Oathbreaker can support it in a mill-focused shell, but the smaller starting life total means milling matters less relative to other strategies.
Key Combos
Combo lines featuring this card
Price Context
Current price
$1.31 cheap tier
At $1.31, Sphinx Mindbreaker sits at the low end of the rare price range — cheap enough that slotting it into a mill Commander build is a no-brainer if the effect fits. The price reflects its narrow appeal outside Commander rather than any weakness in the right shell.
Explore
Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.