Keeper of Keys 
Creature — Human Rogue Mutant
$3.61 #12165 0.50 10.0 years
When this creature enters, you become the monarch.
At the beginning of your upkeep, if you're the monarch, creatures you control can't be blocked this turn.
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Cards similar to Keeper of Keys 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.
Aragorn, King of Gondor96%
$0.55↓#4086↑0.63↑3.2 years↓
"When this card enters, you become the monarch."
+1 more matching line
Crown-Hunter Hireling95%
$0.17↓#24637↓0.00↓10.0 years
"When this creature enters, you become the monarch."
+1 more matching line
Queen Marchesa95%
$1.09↓#2644↑0.37↓10.0 years
"When this card enters, you become the monarch."
+1 more matching line
Court of Grace95%
$3.15↓#1658↑0.25↓5.8 years↓
"When this enchantment enters, you become the monarch."
+1 more matching line
Custodi Lich94%
$0.39↓#97770.14↓10.0 years
"When this creature enters, you become the monarch."
Knights of the Black Rose94%
$0.33↓#118630.00↓10.0 years
"When this creature enters, you become the monarch."
Archon of Coronation94%
$0.57↓#6764↑0.425.8 years↓
"When this creature enters, you become the monarch."
Regal Behemoth93%
$0.44↓#2400↑0.28↓10.0 years
"When this creature enters, you become the monarch."
Entourage of Trest91%
$0.09↓#17074↓0.00↓10.0 years
"When this creature enters, you become the monarch."
+1 more matching line
Palace Jailer91%
$0.22↓#4011↑0.21↓10.0 years
"When this creature enters, you become the monarch."
Court of Cunning91%
$3.91↑#2681↑0.405.8 years↓
"When this enchantment enters, you become the monarch."
Dawnglade Regent90%
$0.53↓#5616↑0.19↓5.8 years↓
"When this creature enters, you become the monarch."
+1 more matching line
Court of Ire90%
$0.31↓#3276↑0.30↓5.8 years↓
"When this enchantment enters, you become the monarch."
Emberwilde Captain89%
$1.73↓#4037↑0.35↓5.8 years↓
"When this creature enters, you become the monarch."
Okoye, Mighty and Adored89%
$0.24↓#16994↓0.00↓0.2 years↓
"When this card enters, you become the monarch."
Fealty to the Realm89%
$0.30↓#103420.20↓3.2 years↓
"When this Aura enters, you become the monarch."
+1 more matching line
Azure Fleet Admiral88%
$0.13↓#100690.24↓5.8 years↓
"This creature can't be blocked by creatures the monarch controls."
+1 more matching line
Staunch Throneguard88%
$0.14↓#17221↓0.25↓5.8 years↓
"When this creature enters, you become the monarch."
Thorn of the Black Rose88%
$0.15↓#9546↑0.29↓10.0 years
"When this creature enters, you become the monarch."
Crimson Fleet Commodore88%
$0.10↓#142900.81↑5.8 years↓
"When this creature enters, you become the monarch."