Keeper of the Accord 

Creature — Human Soldier
$0.48 #1307 0.20 5.9 years
At the beginning of each opponent's end step, if that player controls more creatures than you, create a 1/1 white Soldier creature token.
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.
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Cards similar to Keeper of the Accord 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 Hawk93%
$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 Warhound93%
$0.52↑#1653↓0.115.2 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."
Aerial Surveyor90%
$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."
Stoic Farmer89%
$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."
Claim Jumper88%
$0.37↓#1824↓0.09↓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."
Surveyor's Scope84%
$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."
Knight of the White Orchid84%
$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 Scout84%
$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."
Scholarship Sponsor84%
$0.36↓#12743↓0.05↓5.5 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."
Oath of Lieges83%
$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."
Land Tax82%
$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."
Sunstar Expansionist82%
$0.19↓#17138↓0.00↓1.2 years↓
"When this creature enters, if an opponent controls more lands than you, create a Lander token."
Archaeomancer's Map80%
$0.88↑#680↑0.245.5 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."
Cartographer's Hawk77%
$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."
Scholar of New Horizons76%
$0.28↓#2645↓0.113.9 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."
Explosive Vegetation75%
$0.28↓#12590.1724.0 years↑
"Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle."
Heidegger, Shinra Executive74%
$0.23↓#12080↓0.00↓1.4 years↓
"At the beginning of your end step, create a number of 1/1 white Soldier creature tokens equal to the number of opponents who control more creatures than you."
Boreas Charger74%
$0.28↓#10041↓0.00↓8.2 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."
Priest of the Blessed Graf74%
$0.33↓#12857↓0.00↓4.9 years
"At the beginning of your end step, create X 1/1 white Spirit creature tokens with flying, where X is the number of opponents who control more lands than you."