Migratory Greathorn 
Creature — Beast
$0.27 #5456 0.25 6.4 years
Mutate 
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)Whenever this creature mutates, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
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Cards similar to Migratory Greathorn 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.
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"When you unlock this door, search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
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"Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
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$0.31↑#60630.264.0 years↓
"Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Beneath the Sands92%
$0.23↓#12330↓0.229.1 years↑
"Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Spring // Mind92%
$0.27#15682↓0.359.4 years↑
"Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
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$0.42↑#3037↑0.258.9 years↑
"Whenever this creature is dealt damage, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Ondu Giant90%
$0.15↓#17910↓0.47↑16.4 years↑
"When this creature enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Farhaven Elf90%
$0.16↓#1483↑0.1618.3 years↑
"When this creature enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Wild Wanderer90%
$0.15↓#18005↓0.57↑9.9 years↑
"When this creature enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Quirion Trailblazer90%
$0.21↓#22510↓0.53↑25.9 years↑
"When this creature enters, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle."
Natural Connection90%
$0.09↓#11894↓0.07↓10.9 years↑
"Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Thunderherd Migration90%
$0.17↓#54470.07↓8.6 years↑
"Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Omen of the Hunt90%
$0.21↓#10330↓0.00↓6.6 years
"When this enchantment enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Yavimaya Granger90%
$0.15↓#17060↓0.00↓27.6 years↑
"When this creature enters, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle."
Rampant Growth90%
$0.36↑#26↑0.1929.9 years↑
"Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle."
Migration Path90%
$0.35↑#1200↑0.15↓6.4 years
"Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle."
Frontier Guide90%
$0.15↓#14936↓0.41↑16.9 years↑
", 
: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
, : Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Greater Tanuki90%
$0.26↓#7027↓0.254.5 years↓
", Discard this card: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
, Discard this card: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
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$0.24↓#1795↑0.11↓19.9 years↑
"Search your library for a basic land card, put it onto the battlefield, then shuffle."
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"Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle."