Unwelcome Sprite 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 you cast a spell during an opponent's turn, surveil 2. (Look at the top two cards of your library. You may put any number of them into your graveyard and the rest on top of your library in any order.)
Complete guide
Unwelcome Sprite is a tactical Faerie Rogue that rewards you for playing on your opponent's terms. With its ability to refine your draws every time you act during an opponent's turn, it transforms reactive plays into proactive value. This evasive creature ensures that every instant or flash spell you cast helps dig for your next big answer.
Flying and Filtering
Unwelcome Sprite possesses two key features: the Flying keyword and a triggered ability that occurs whenever you cast a spell during an opponent's turn. Flying means this creature can't be blocked except by creatures with flying or reach. The triggered ability utilizes the Surveil 2 keyword, allowing you to look at the top two cards of your library, choose how many go to the graveyard, and organize the remainder on top of your library.
The Timing of Surveil
The ability triggers the moment you finish casting a spell during an opponent's turn. This means the Surveil 2 ability goes on the stack on top of the spell you just cast. You will perform the surveil action before the spell that triggered it actually resolves. This is particularly useful if you need to set up your next draw or clear unwanted cards off the top of your library before an effect occurs.
Strategic Considerations
To maximize Unwelcome Sprite, you must focus on spells with Flash or Instant timing. A common mistake is assuming the ability triggers on your own turn; it only triggers during an opponent's turn. Since the ability is a 'Whenever' trigger, it will trigger for every spell you cast, meaning if you cast multiple spells in a single opponent's turn, you will surveil 2 for each one individually.
Interaction examples
If you have Unwelcome Sprite on the battlefield and cast Ornithopter of Paradise during your opponent's turn (provided you have an effect giving it flash), the Sprite's ability triggers. You look at the top two cards of your library, potentially discarding them to fuel your graveyard or keeping a land on top for your next turn. Only after you finish surveilling will the Ornithopter of Paradise resolve and enter the battlefield as a flying mana source.
With both creatures in play, if you cast an artifact spell with Flash during your opponent's turn, Foundry Inspector reduces the cost by {1}. As soon as you pay the reduced cost and finish casting, Unwelcome Sprite triggers. This allows you to filter through your deck more efficiently while maintaining board presence with your cost-reducing Construct and your evasive Faerie.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Unwelcome Sprite
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Unwelcome Sprite
No archived Top 8 deck with this card yet.



Ornithopter of Paradise
Foundry Inspector