Cartouche of Ambition 
Enchantment — Aura Cartouche
$0.14 #15685 0.25 9.5 years
Enchant creature you control
When this Aura enters, you may put a -1/-1 counter on target creature.
Enchanted creature gets +1/+1 and has lifelink.
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Cards similar to Cartouche of Ambition 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.
Cultbrand Cinder90%
$0.11↓#30659↓0.00↓18.5 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Skinrender90%
$0.23↑#5692↑0.69↑16.1 years↑
"When this creature enters, put three -1/-1 counters on target creature."
Squire's Devotion88%
$0.22↑#155060.13↓8.8 years
"Enchanted creature gets +1/+1 and has lifelink."
Gurmag Rakshasa87%
$0.11↓#21766↓0.06↓1.5 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn and target creature you control gets +2/+2 until end of turn."
Ancestral Vengeance84%
$0.04↓#22740↓0.1811.7 years↑
"When this Aura enters, put a +1/+1 counter on target creature you control."
Blight Rot84%
$0.28↑#8917↑0.04↓0.7 years↓
"Put four -1/-1 counters on target creature."
Scar83%
$0.23↑#19802↓0.1918.5 years↑
"Put a -1/-1 counter on target creature."
Mark of the Vampire82%
$0.13↓#156120.00↓14.3 years↑
"Enchanted creature gets +2/+2 and has lifelink."
+1 more matching line
Contagion Clasp81%
$0.34↑#1416↑0.2916.1 years↑
"When this artifact enters, put a -1/-1 counter on target creature."
Banewhip Punisher80%
$0.25↑#11192↑0.06↓9.3 years
"When this creature enters, you may put a -1/-1 counter on target creature."
Eyeblight Assassin80%
$0.09↓#22239↓0.06↓11.3 years↑
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Instill Infection80%
$0.09↓#24167↓0.3516.1 years↑
"Put a -1/-1 counter on target creature."
Dissection Practice80%
$0.22↑#167640.03↓0.5 years↓
"Up to one target creature gets -1/-1 until end of turn."
Blister Beetle80%
$0.04↓#25026↓0.43↑18.0 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Farbog Boneflinger80%
$0.08↓#30945↓0.1814.7 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Pith Driller79%
$0.15↑#28174↓0.2815.4 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Lifelink79%
$0.28↑#10556↑0.07↓17.3 years↑
"Enchanted creature has lifelink."
+1 more matching line
Fourth Bridge Prowler79%
$0.22↑#150290.06↓9.7 years
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Keening Banshee78%
$0.12↓#27674↓0.13↓21.2 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Skulking Killer78%
$0.03↓#25620↓0.06↓4.9 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures."