Thief of Sanity is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Flying Whenever this creature deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.
Complete guide
Thief of Sanity is a powerful Dimir Specter that allows you to dismantle your opponent's deck while building your own board state. By dealing combat damage, you gain access to their best tools, effectively turning their own strategy against them. This guide will help you master the nuances of exiling and casting cards from your opponent's library.
Stealing from the Library
When Thief of Sanity deals combat damage to a player, you look at the top three cards of their library. You choose one to exile face down and put the others into their graveyard. Because the card is face down, you are the only one who knows what it is until you choose to cast it. Crucially, the ability allows you to spend mana of any type to cast that spell, meaning you don't need to worry about having the specific colors of mana your opponent's deck requires.
Timing and Restrictions
While Thief of Sanity gives you permission to cast the exiled card, it does not change the timing rules. If you exile a creature or sorcery, you must still wait for your main phase when the stack is empty to cast it. Additionally, you cannot play lands found this way, as the ability specifically uses the word 'cast,' which does not apply to land cards. If you choose a land from the top three, it will remain in exile forever, unusable.
Persistent Effects
One of the strongest features of this card is that the permission to cast the exiled card lasts for as long as the card remains in exile. Even if Thief of Sanity is destroyed or leaves the battlefield, you can still cast any cards you previously exiled with it. However, if you leave a multiplayer game, those cards stay face down in exile and no one else can look at or use them.
Interaction examples
Roaming ThroneIf you control Roaming Throne and chose 'Specter' as it entered the battlefield, Thief of Sanity's ability will trigger an additional time whenever it deals combat damage to a player. You will resolve the first trigger to exile one of three cards, then resolve the second trigger to exile another card from the next three. This gives you two face-down cards to cast later.
Solemn SimulacrumIf you exile Solemn Simulacrum with Thief of Sanity, you can cast it during your main phase using any color of mana (or colorless mana). When it enters the battlefield, you search your library for a basic land as normal. If it later dies, you draw a card from your own library, even though the creature originally belonged to your opponent.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Thief of Sanity
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Thief of Sanity's effect doesn't change when you can cast the exiled card. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.
No other card is named in this ruling.
- #2· Wizards of the Coast
An effect that instructs you to "cast" a card doesn't allow you to play lands.
No other card is named in this ruling.
- #3· Wizards of the Coast
You can still cast the exiled card if Thief of Sanity leaves the battlefield or leaves your control. If another player gains control of Thief of Sanity, that player can't cast the exiled card.
No other card is named in this ruling.
- #4· Wizards of the Coast
Casting an exiled card causes it to leave exile. You can't cast it multiple times.
No other card is named in this ruling.
- #5· Wizards of the Coast
In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any spells or permanents you control from Thief of Sanity's effect are exiled, and any of the face-down exiled cards remain face down indefinitely. No player may look at them.
No other card is named in this ruling.
Legal formats
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Meta decks with Thief of Sanity
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