Blightbelly Rat {1}{B}
Creature — Phyrexian Rat
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
When this creature dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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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.
Deadly Grub 84%
$0.06#20704
"When this creature dies, if it had no time counters on it, create a 6/1 green Insect creature token with shroud."
Vaultborn Tyrant 83%
$32.68#1809
"When this creature dies, if it's not a token, create a token that's a copy of it, except it's an artifact in addition to its other types."
Welkin Hawk 83%
$0.11#31472
"When this creature dies, you may search your library for a card named this card, reveal that card, put it into your hand, then shuffle."
Goblin Snowman 82%
$0.54#20839
"Whenever this creature blocks, prevent all combat damage that would be dealt to and dealt by it this turn."
Wretched Throng 82%
$0.05#28987
"When this creature dies, you may search your library for a card named this card, reveal it, put it into your hand, then shuffle."
Noble Benefactor 82%
$0.43#11901
"When this creature dies, each player may search their library for a card and put that card into their hand. Then each player who searched their library this way shuffles."
Flesh Carver 82%
$0.38#19770
"When this creature dies, create an X/X black Horror creature token, where X is this creature's power."
Kinsbaile Borderguard 82%
$6.33#18092
"When this creature dies, create a 1/1 white Kithkin Soldier creature token for each counter on it."
Harried Spearguard 82%
$0.16#14278
"When this creature dies, create a 1/1 black Rat creature token with "This token can't block.""
Liege of the Hollows 82%
$5.52#19842
"When this creature dies, each player may pay any amount of mana. Then each player creates a number of 1/1 green Squirrel creature tokens equal to the amount of mana they paid this way."
Ambitious Augmenter 82%
$0.27#15890
"When this creature dies, if it had one or more counters on it, create a 0/0 green and blue Fractal creature token, then put this creature's counters on that token."
Tangled Colony 82%
$0.74#5341
"When this creature dies, create X 1/1 black Rat creature tokens with "This token can't block," where X is the amount of damage dealt to it this turn."
Termagant Swarm 82%
$2.34#6499
"When this creature dies, create a number of 1/1 green Tyranid creature tokens equal to this creature's power."
Synapse Necromage 81%
$0.16#16244
"When this creature dies, create two 1/1 black Fungus creature tokens with "This token can't block.""
Wurmcoil Engine 81%
$10.57#1038
"When this creature dies, create a 3/3 colorless Phyrexian Wurm artifact creature token with deathtouch and a 3/3 colorless Phyrexian Wurm artifact creature token with lifelink."
Seed Guardian 81%
$0.06#24040
"When this creature dies, create an X/X green Elemental creature token, where X is the number of creature cards in your graveyard."
Draconic Muralists 81%
$0.27#7232
"When this creature dies, you may search your library for a Dragon card, reveal it, put it into your hand, then shuffle."