Loyal Warhound 
Creature — Dog
$0.52 #1653 0.11 5.2 years
Vigilance
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.
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Cards similar to Loyal Warhound 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.
Scouting Hawk100%
$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."
Stoic Farmer96%
$0.35↓#12012↓0.00↓5.7 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."
Knight of the White Orchid94%
$0.91↑#659↑0.1718.0 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 Scout93%
$0.59↑#10433↓0.124.0 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."
Keeper of the Accord93%
$0.48↓#1307↑0.205.9 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."
Claim Jumper92%
$0.37↓#18240.092.5 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."
+1 more matching line
Aerial Surveyor91%
$1.07↑#5111↓0.00↓4.7 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."
Scholarship Sponsor90%
$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."
Sunstar Expansionist90%
$0.19↓#17138↓0.00↓1.2 years↓
"When this creature enters, if an opponent controls more lands than you, create a Lander token."
Land Tax84%
$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."
Oath of Lieges84%
$3.99↑#12701↓0.00↓28.3 years↑
"At the beginning of each player's upkeep, that player chooses target player who controls more lands than they do and is their opponent. The first player may search their library for a basic land card, put that card onto the battlefield, then shuffle."
Cartographer's Hawk84%
$0.16↓#4733↓0.00↓6.5 years↑
"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."
Surveyor's Scope83%
$3.53↑#7985↓0.1313.0 years↑
"
, Exile this artifact: Search your library for up to X basic land cards, where X is the number of players who control at least two more lands than you. Put those cards onto the battlefield, then shuffle."
, Exile this artifact: Search your library for up to X basic land cards, where X is the number of players who control at least two more lands than you. Put those cards onto the battlefield, then shuffle."
Archaeomancer's Map82%
$0.88↑#680↑0.24↑5.5 years
"When this artifact enters, search your library for up to two basic Plains cards, reveal them, put them into your hand, then shuffle."
Sunblade Samurai82%
$0.11↓#14187↓0.00↓4.7 years
"Vigilance"
Sand Scout80%
$5.09↑#5124↓0.22↑2.5 years↓
"When this creature enters, if an opponent controls more lands than you, search your library for a Desert card, put it onto the battlefield tapped, then shuffle."
Quirion Trailblazer80%
$0.25↓#22812↓0.00↓26.0 years↑
"When this creature enters, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle."
Wild Wanderer80%
$0.13↓#18327↓0.00↓10.1 years↑
"When this creature enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Ondu Giant80%
$0.21↓#18324↓0.00↓16.5 years↑
"When this creature enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Farhaven Elf80%
$0.17↓#15250.1218.5 years↑
"When this creature enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."