Archaeomancer's Map 
Artifact
$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.
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.
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Cards similar to Archaeomancer's Map 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.
Stoic Farmer86%
$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."
Burgeoning86%
$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."
Ambitious Farmhand // Seasoned Cathar84%
$0.22↓#11234↓0.00↓5.1 years
"When this creature enters, you may search your library for a basic Plains card, reveal it, put it into your hand, then shuffle."
The Birth of Meletis82%
$0.26↓#7573↓0.00↓6.7 years↑
"Search your library for a basic Plains card, reveal it, put it into your hand, then shuffle."
Scouting Hawk82%
$0.23↓#9652↓0.06↓4.4 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 Warhound82%
$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."
Pilgrim of the Ages81%
$0.16↓#18711↓0.00↓5.5 years
"When this creature enters, you may search your library for a basic Plains card, reveal it, put it into your hand, then shuffle."
Keeper of the Accord80%
$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."
Sunstar Expansionist78%
$0.19↓#17138↓0.00↓1.2 years↓
"When this creature enters, if an opponent controls more lands than you, create a Lander token."
Clay-Fired Bricks // Cosmium Kiln77%
$0.19↓#12686↓0.00↓2.9 years↓
"When this artifact enters, search your library for a basic Plains card, reveal it, put it into your hand, then shuffle. You gain 2 life."
Land Tax76%
$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."
Shattered Angel76%
$0.51↓#6694↓0.07↓15.4 years↑
"Whenever a land an opponent controls enters, you may gain 3 life."
Oreskos Explorer76%
$0.17↓#6157↓0.00↓10.9 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."
The Restoration of Eiganjo // Architect of Restoration75%
$0.51↓#4400↓0.48↑4.7 years
"Search your library for a basic Plains card, reveal it, put it into your hand, then shuffle."
Foe-liage75%
$0.18↓#25936↓0.160.6 years↓
"Whenever a land enters during your turn, put a +1/+1 counter on this creature."
Lifegift75%
$11.55↑#11485↓0.1521.7 years↑
"Whenever a land enters, you may gain 1 life."
Kayla's Command74%
$0.22↓#14776↓0.06↓3.9 years↓
"• Search your library for a basic Plains card, reveal it, put it into your hand, then shuffle."
Flower // Flourish74%
$0.14↓#20479↓0.06↓8.0 years↑
"Search your library for a basic Forest or Plains card, reveal it, put it into your hand, then shuffle."
Jeskai Monument74%
$0.15↓#18822↓0.00↓1.5 years↓
"When this artifact enters, search your library for a basic Island, Mountain, or Plains card, reveal it, put it into your hand, then shuffle."
Yasharn, Implacable Earth74%
$0.38↓#5504↓1.24↑6.1 years
"When this card enters, search your library for a basic Forest card and a basic Plains card, reveal those cards, put them into your hand, then shuffle."