Loyal Warhound 

Creature — Dog
$0.47 #1636 0.13 5.1 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?
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Scouting Hawk100%
$0.25↓#9434↓0.214.2 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."
Stoic Farmer96%
$0.38↓#11780↓0.68↑5.6 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."
Keeper of the Accord92%
$0.48↑#1258↑0.24↑5.8 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."
Aerial Surveyor90%
$1.13↑#5000↓0.194.5 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."
Knight of the White Orchid90%
$0.80↑#644↑0.1717.9 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 Scout89%
$0.63↑#10194↓0.35↑3.9 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."
Sunstar Expansionist89%
$0.17↓#17176↓0.01↓1.1 years↓
"When this creature enters, if an opponent controls more lands than you, create a Lander token."
Scholarship Sponsor88%
$0.35↓#12612↓0.145.4 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."
Claim Jumper87%
$0.39↓#18370.152.4 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
Quirion Trailblazer83%
$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."
Ondu Giant83%
$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 Elf83%
$0.16↓#14830.1618.3 years↑
"When this creature enters, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Wild Wanderer83%
$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."
Yavimaya Granger82%
$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."
Oath of Lieges80%
$4.10↑#12636↓0.45↑28.2 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 Hawk80%
$0.19↓#4656↓0.25↑6.4 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."