Unstable Mutation 
Enchantment — Aura
Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.
click a line to search just that ability, click more to combine them
Cards that do something similar 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.
Essence Flare 100%
#29799
"At the beginning of the upkeep of enchanted creature's controller, put a -0/-1 counter on that creature."
+1 more matching line
Takklemaggot 100%
#23741
"At the beginning of the upkeep of enchanted creature's controller, put a -0/-1 counter on that creature."
Glistening Oil 95%
$12.56#6769
"At the beginning of your upkeep, put a -1/-1 counter on enchanted creature."
+1 more matching line
Biting Tether 95%
$0.26#25912
"At the beginning of your upkeep, put a -1/-1 counter on enchanted creature."
+1 more matching line
Spirit Shackle 86%
#29527
"Whenever enchanted creature becomes tapped, put a -0/-2 counter on it."
+1 more matching line
Lichenthrope 80%
$0.60#28461
"At the beginning of your upkeep, remove a -1/-1 counter from this creature."