Sleeper Agent 
Creature — Phyrexian Minion
$1.73 #11642 0.33 28.0 years
When this creature enters, target opponent gains control of it.
At the beginning of your upkeep, this creature deals 2 damage to you.
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Cards similar to Sleeper Agent 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.
Witch Hunt92%
$0.38↓#16333↓0.2713.0 years↓
"At the beginning of your upkeep, this enchantment deals 4 damage to you."
+1 more matching line
Jinxed Idol92%
$1.06↓#94160.10↓29.0 years
"At the beginning of your upkeep, this artifact deals 2 damage to you."
+1 more matching line
Akroan Horse88%
$0.51↓#4441↑0.03↓13.1 years↓
"When this creature enters, an opponent gains control of it."
Jinxed Choker85%
$2.41↑#116010.06↓23.0 years↓
"At the beginning of your upkeep, this artifact deals damage to you equal to the number of charge counters on it."
+1 more matching line
Vislor Turlough82%
$0.35↓#125390.17↓3.0 years↓
"When this card enters, you may have an opponent gain control of it. If you do, it's goaded for as long as they control it."
Measure of Wickedness81%
$0.30↓#25753↓0.3021.4 years↓
"Whenever another card is put into your graveyard from anywhere, target opponent gains control of this enchantment."
+1 more matching line
Jinxed Ring80%
$3.28↑#137660.53↑28.6 years
"Whenever a nontoken permanent is put into your graveyard from the battlefield, this artifact deals 1 damage to you."
+1 more matching line
Captive Audience78%
$3.45↑#7636↑0.92↑7.7 years↓
"This enchantment enters under the control of an opponent of your choice."
Crag Saurian78%
$0.44↓#29168↓0.2427.0 years
"Whenever a source deals damage to this creature, that source's controller gains control of this creature."
Crown of Doom78%
$2.55↑#9177↑0.16↓12.0 years↓
"
: Target player other than this artifact's owner gains control of it. Activate only during your turn."
: Target player other than this artifact's owner gains control of it. Activate only during your turn."
Relic Robber78%
$0.25↓#14899↓0.296.1 years↓
"Whenever this creature deals combat damage to a player, that player creates a 0/1 colorless Goblin Construct artifact creature token with "This token can't block" and "At the beginning of your upkeep, this token deals 1 damage to you.""
Xantcha, Sleeper Agent76%
$1.23↓#3038↑0.47↑8.2 years↓
"this card enters under the control of an opponent of your choice."
Treacherous Pit-Dweller76%
$0.34↓#18618↓0.57↑14.5 years↓
"When this creature enters from a graveyard, target opponent gains control of it."
Goblin Cadets73%
$2.65↑#120950.00↓28.0 years
"Whenever this creature blocks or becomes blocked, target opponent gains control of it."
Ghazbán Ogre72%
$0.10↓#30924↓0.00↓32.8 years↑
"At the beginning of your upkeep, if a player has more life than each other player, the player with the most life gains control of this creature."
Risky Move72%
$1.24↓#120310.56↑24.0 years↓
"At the beginning of each player's upkeep, that player gains control of this enchantment."
Emberwilde Djinn70%
$0.63↓#29277↓0.00↓30.0 years↑
"At the beginning of each player's upkeep, that player may pay 
or 2 life. If the player does, they gain control of this creature."
or 2 life. If the player does, they gain control of this creature."
Loxodon Peacekeeper70%
$0.36↓#22099↓0.00↓23.0 years↓
"At the beginning of your upkeep, the player with the lowest life total gains control of this creature. If two or more players are tied for lowest life total, you choose one of them, and that player gains control of this creature."