Thought Harvester 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
Devoid (This card has no color.) Flying Whenever you cast a colorless spell, target opponent exiles the top card of their library.
Complete guide
Thought Harvester is a versatile Eldrazi Drone that punishes your opponents every time you lean into the lack of color in your deck. By utilizing the Devoid mechanic, this creature itself counts as colorless despite its blue mana cost, making it a perfect engine for library disruption. Whether you are casting artifacts or ancient Eldrazi, your opponent's resources will slowly vanish into exile.
Understanding Colorless Synergy
Thought Harvester features the Devoid keyword, which means it has no color regardless of the mana used to cast it. Its primary utility comes from its triggered ability: whenever you cast a colorless spell, a target opponent exiles the top card of their library. These cards are exiled face up, and because the ability triggers on the 'cast' event, it will always resolve before the actual spell that triggered it reaches the battlefield or takes effect.
Step-by-Step Resolution
When you cast a colorless spell, such as an artifact or a spell with Devoid, Thought Harvester's ability is placed on the stack on top of that spell. You must choose a target opponent at this time. The ability resolves first, exiling the top card of their library face up. Afterward, the original colorless spell you cast will attempt to resolve. If the colorless spell is countered, the exile trigger still happens because the act of casting was successful.
Timing and Strategy
Common mistakes include forgetting that artifacts are colorless spells and will trigger the Harvester. It is best to play Thought Harvester early in a deck with high artifact or Eldrazi density to maximize the number of triggers. In formats with 'Processors,' you can even use the cards exiled by Thought Harvester as fuel for other Eldrazi abilities that require moving cards from exile back to the graveyard.
Interaction examples
Solemn SimulacrumWhen you cast Solemn Simulacrum while Thought Harvester is on the battlefield, the Harvester's ability triggers because the Simulacrum is a colorless artifact spell. The exile trigger resolves first, removing the top card of your opponent's library. Then, Solemn Simulacrum resolves and enters the battlefield, allowing you to search for a land. This sequence ensures you gain both board presence and library disruption simultaneously.
Roaming ThroneIf you cast Roaming Throne and choose 'Eldrazi' or 'Drone' as it enters the battlefield, it becomes a colorless creature of that type. While both are on the battlefield, casting any further colorless spells will trigger Thought Harvester's ability twice. For example, if you cast another artifact, Roaming Throne causes the Harvester to trigger an additional time, resulting in your opponent exiling the top two cards of their library instead of one.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Thought Harvester
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
The card is exiled face up.
No other card is named in this ruling.
- #2· Wizards of the Coast
The triggered ability will resolve before the colorless spell that caused it to trigger.
No other card is named in this ruling.
- #3· Wizards of the Coast
The Battle for Zendikar colorless creature cards Blight Herder and Ruin Processor each have an ability that triggers when you cast it that allows you to put a card owned by an opponent from exile into that player’s graveyard. Both that ability and Thought Harvester’s ability trigger at the same time, so you can put them on the stack in any order. If Thought Harvester’s ability resolves first (meaning it went on the stack last), the card exiled by that ability can be “processed” by the other ability.
No other card is named in this ruling.
Legal formats
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Meta decks with Thought Harvester
No archived Top 8 deck with this card yet.