Junk Golem {4}
Artifact Creature — Golem
This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, sacrifice this creature unless you remove a +1/+1 counter from it.
{1}, Discard a card: Put a +1/+1 counter on this creature.
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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.
Mindless Automaton 100%
$0.26#4774
"{1}, Discard a card: Put a +1/+1 counter on this creature."
+1 more matching line
Crovax the Cursed 87%
#26326
"At the beginning of your upkeep, you may sacrifice a creature. If you do, put a +1/+1 counter on Crovax. If you don't, remove a +1/+1 counter from Crovax."
Razormane Masticore 86%
$0.21#26753
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Molten-Tail Masticore 86%
$0.39#29145
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Masticore 86%
#24663
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Endless Wurm 83%
$1.99#26828
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice an enchantment."
Reclusive Wight 82%
$0.20#31015
"At the beginning of your upkeep, if you control another nonland permanent, sacrifice this creature."
Glint-Eye Nephilim 82%
$0.20#18168
"{1}, Discard a card: This creature gets +1/+1 until end of turn."
Anurid Scavenger 81%
$0.24#23124
"At the beginning of your upkeep, sacrifice this creature unless you put a card from your graveyard on the bottom of your library."
Kami of the Tended Garden 80%
$0.11#29053
"At the beginning of your upkeep, sacrifice this creature unless you pay {G}."
Wild Leotau 80%
$0.08#31338
"At the beginning of your upkeep, sacrifice this creature unless you pay {G}."
Molting Harpy 80%
$0.16#30455
"At the beginning of your upkeep, sacrifice this creature unless you pay {2}."