Myr Prototype {5}
Artifact Creature — Myr
At the beginning of your upkeep, put a +1/+1 counter on this creature.
This creature can't attack or block unless you pay {1} for each +1/+1 counter on it.
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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.
Necroplasm 100%
$0.89#15336
"At the beginning of your upkeep, put a +1/+1 counter on this creature."
Rushwood Elemental 97%
$0.89#27656
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Chlorophant 97%
$0.44#27433
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Vebulid 97%
$0.65#25829
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Slumbering Dragon 92%
$2.40#12250
"This creature can't attack or block unless it has five or more +1/+1 counters on it."
Wiitigo 91%
#29999
"At the beginning of your upkeep, put a +1/+1 counter on this creature if it has blocked or been blocked since your last upkeep. Otherwise, remove a +1/+1 counter from it."
Ingenious Prodigy 89%
$0.25#3206
"At the beginning of your upkeep, if this creature has one or more +1/+1 counters on it, you may remove a +1/+1 counter from it. If you do, draw a card."
Magmasaur 89%
#26893
"At the beginning of your upkeep, you may remove a +1/+1 counter from this creature. If you don't, sacrifice this creature and it deals damage equal to the number of +1/+1 counters on it to each creature without flying and each player."
Tetravus 85%
#23275
"At the beginning of your upkeep, you may remove any number of +1/+1 counters from this creature. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and "This token can't be enchanted.""