Cartographer's Hawk 
Creature — Bird
$0.16 #4733 0.00 6.5 years
Flying
When this creature deals combat damage to a player who controls more lands than you, return it to its owner's hand. If you do, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle.
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Cards similar to Cartographer's Hawk 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.
Knight of the White Orchid90%
$0.91↑#659↑0.17↑18.0 years↑
"When this creature enters, if an opponent controls more lands than you, you may search your library for a Plains card, put it onto the battlefield, then shuffle."
Space Marine Scout90%
$0.59↑#10433↓0.12↑4.0 years↓
"When this creature enters, if an opponent controls more lands than you, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle."
Claim Jumper90%
$0.37↑#1824↑0.092.5 years↓
"When this creature enters, if an opponent controls more lands than you, you may search your library for a Plains card and put it onto the battlefield tapped. Then if an opponent controls more lands than you, repeat this process once. If you search your library this way, shuffle."
Boreas Charger86%
$0.28↑#10041↓0.008.2 years↑
"When this creature leaves the battlefield, choose an opponent who controls more lands than you. Search your library for a number of Plains cards equal to the difference, reveal those cards, put one of them onto the battlefield tapped and the rest into your hand, then shuffle."
Gift of Estates86%
$1.16↑#51250.16↑29.5 years↑
"If an opponent controls more lands than you, search your library for up to three Plains cards, reveal them, put them into your hand, then shuffle."
Oreskos Explorer84%
$0.17↑#6157↓0.0010.9 years↑
"When this creature enters, search your library for up to X Plains cards, where X is the number of players who control more lands than you. Reveal those cards, put them into your hand, then shuffle."
Tithe84%
$37.57↑#8957↓0.0529.7 years↑
"Search your library for a Plains card. If target opponent controls more lands than you, you may search your library for an additional Plains card. Reveal those cards, put them into your hand, then shuffle."
Scouting Hawk84%
$0.23↑#9652↓0.064.4 years↓
"When this creature enters, if an opponent controls more lands than you, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle."
Loyal Warhound84%
$0.52↑#1653↑0.11↑5.2 years↓
"When this creature enters, if an opponent controls more lands than you, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle."
Scholar of New Horizons84%
$0.28↑#2645↑0.11↑3.9 years↓
"
, Remove a counter from a permanent you control: Search your library for a Plains card and reveal it. If an opponent controls more lands than you, you may put that card onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand. Then shuffle."
, Remove a counter from a permanent you control: Search your library for a Plains card and reveal it. If an opponent controls more lands than you, you may put that card onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand. Then shuffle."
Stoic Farmer82%
$0.35↑#12012↓0.005.7 years
"When this creature enters, search your library for a basic Plains card and reveal it. If an opponent controls more lands than you, put it onto the battlefield tapped. Otherwise, put it into your hand. Then shuffle."
Aerial Surveyor81%
$1.07↑#51110.004.7 years↓
"Whenever this Vehicle attacks, if defending player controls more lands than you, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle."
+1 more matching line
Silkwing Scout80%
$0.16#27489↓0.11↑20.5 years↑
"Flying"
Cloudbound Moogle80%
$0.17↑#14322↓0.30↑1.4 years↓
"Flying"
Balshan Griffin80%
$0.21↑#32083↓0.0625.1 years↑
"Flying"
Kor Cartographer78%
$0.13↓#41970.11↑17.0 years↑
"When this creature enters, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle."
Keeper of the Accord77%
$0.48↑#1307↑0.20↑5.9 years
"At the beginning of each opponent's end step, if that player controls more lands than you, you may search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle."
Sunstar Expansionist75%
$0.19↑#17138↓0.001.2 years↓
"When this creature enters, if an opponent controls more lands than you, create a Lander token."
Land Tax74%
$16.81↑#356↑0.83↑32.4 years↑
"At the beginning of your upkeep, if an opponent controls more lands than you, you may search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle."
Scholarship Sponsor74%
$0.36↑#12743↓0.055.5 years↓
"When this creature enters, each player who controls fewer lands than the player who controls the most lands searches their library for a number of basic land cards less than or equal to the difference, puts those cards onto the battlefield tapped, then shuffles."