Deep Gnome Terramancer 
Creature — Gnome Wizard
$8.61 #2238 0.38 4.4 years
Flash
Mold Earth — Whenever one or more lands enter under an opponent's control without being played, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle. Do this only once each turn.
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Kor Cartographer80%
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"When this creature enters, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle."
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"Whenever a land enters under an opponent's control, if that player had another land enter the battlefield under their control this turn, this creature deals 3 damage to that player."
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"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."
Ankh of Mishra75%
$8.82↑#5030↓1.01↑33.2 years↑
"Whenever a land enters, this artifact deals 2 damage to that land's controller."
Space Marine Scout74%
$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 Jumper74%
$0.37↓#18240.09↓2.5 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."
Confounding Conundrum74%
$0.30↓#8205↓0.296.1 years↑
"Whenever a land an opponent controls enters, if that player had another land enter the battlefield under their control this turn, they return a land they control to its owner's hand."
Burgeoning72%
$30.33↑#909↑1.16↑28.6 years↑
"Whenever an opponent plays a land, you may put a land card from your hand onto the battlefield."
Archaeomancer's Map72%
$0.88↓#680↑0.24↓5.5 years↑
"Whenever a land an opponent controls enters, if that player controls more lands than you, you may put a land card from your hand onto the battlefield."
Alms Collector70%
$1.04↓#4201↓0.369.2 years↑
"Flash"
Shattered Angel70%
$0.51↓#6694↓0.07↓15.4 years↑
"Whenever a land an opponent controls enters, you may gain 3 life."