Splitting Slime {3}{G}{G}
Creature — Ooze
{4}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When this creature becomes monstrous, create a token that's a copy of this creature. (The token has no counters and isn't monstrous.)
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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.
Nemesis of Mortals 97%
$0.09#18725
"{7}{G}{G}: Monstrosity 5. This ability costs {1} less to activate for each creature card in your graveyard."
Polyraptor 87%
$16.28#3655
"Whenever this creature is dealt damage, create a token that's a copy of this creature."
Sprouting Phytohydra 85%
$3.51#16781
"Whenever this creature is dealt damage, you may create a token that's a copy of this creature."
Watchful Radstag 85%
$1.42#6137
"Whenever this creature evolves, create a token that's a copy of it."
Maester Seymour 84%
$0.38#3958
"{3}{G}{G}: Monstrosity X, where X is the number of counters among creatures you control."
Conclave Evangelist 81%
$2.58#13660
"Whenever this creature deals combat damage to a player, create a token that's a copy of this creature."
Spawnwrithe 81%
$0.35#12601
"Whenever this creature deals combat damage to a player, create a token that's a copy of this creature."
Mist-Syndicate Naga 81%
$3.60#5069
"Whenever this creature deals combat damage to a player, create a token that's a copy of this creature."