Soulcipher Board // Cipherbound Spirit
Artifact // Creature — Spirit
This artifact enters with three omen counters on it.
{1}{U}, {T}: Look at the top two cards of your library. Put one of them into your graveyard.
Whenever a creature card is put into your graveyard from anywhere, remove an omen counter from this artifact. Then if it has no omen counters on it, transform it.
Flying
This creature can block only creatures with flying.
{3}{U}: Draw two cards, then discard a card.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Search for Azcanta // Azcanta, the Sunken Ruin 92%
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"{2}{U}, {T}: Look at the top four cards of your library. You may reveal a noncreature, nonland card from among them and put it into your hand. Put the rest on the bottom of your library in any order."
Flying Drone 84%
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"{1}{U}, {T}: Draw a card, then discard a card. This ability costs {1}{U} less to activate if another creature with flying entered under your control this turn."
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"{2}{U}, {T}: Draw a card, then discard a card. If the discarded card was an artifact card, exile it from your graveyard. If you do, create a token that's a copy of it, except it's a 0/2 Thopter artifact creature with flying in addition to its other types."
+1 more matching line
Aven Fateshaper 80%
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"{4}{U}: Look at the top four cards of your library, then put them back in any order."
Shacklegeist 100%
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"This creature can block only creatures with flying."
+1 more matching line
Stratozeppelid 100%
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"This creature can block only creatures with flying."
+1 more matching line