Agent of Treachery 
Creature — Human Rogue
$3.53 #2121 1.31 7.2 years
When this creature enters, gain control of target permanent.
At the beginning of your end step, if you control three or more permanents you don't own, draw three cards.
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Cards similar to Agent of Treachery 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.
Staff of Eden, Vault's Key78%
$2.67↓#5594↓0.07↓2.2 years↓
"
: Draw a card for each permanent you control but don't own."
: Draw a card for each permanent you control but don't own."+1 more matching line
Blatant Thievery76%
$1.16↓#4671↓0.85↓23.9 years↑
"For each opponent, gain control of target permanent that player controls."
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"At the beginning of your upkeep, you may exchange control of this enchantment and target permanent you neither own nor control."
Kiora Bests the Sea God73%
$8.16↑#4608↓0.55↓6.6 years
"Gain control of target permanent an opponent controls. Untap it."
Role Reversal70%
$0.32↓#7745↓0.50↓7.3 years
"Exchange control of two target permanents that share a permanent type."
Zealous Conscripts70%
$0.25↓#23630.62↓14.3 years↑
"When this creature enters, gain control of target permanent until end of turn. Untap that permanent. It gains haste until end of turn."