Brood Sliver 
Creature — Sliver
$5.02 #5229 0.39 23.6 years
Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token.
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Cards similar to Brood Sliver 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.
Synapse Sliver83%
$3.83↓#57890.65↑23.6 years
"Whenever a Sliver deals combat damage to a player, its controller may draw a card."
Tempered Sliver80%
$0.29↓#11436↓0.317.2 years↓
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.""
Leeching Sliver76%
$0.72↓#10974↓0.22↓12.1 years↓
"Whenever a Sliver you control attacks, defending player loses 1 life."
Essence Sliver74%
$7.92↑#8487↓0.3223.6 years
"Whenever a Sliver deals damage, its controller gains that much life."
Cadira, Caller of the Small72%
$0.18↓#3819↑0.17↓4.2 years↓
"Whenever this card deals combat damage to a player, for each token you control, create a 1/1 white Rabbit creature token."
Capricious Sliver72%
$0.60↓#13381↓0.69↑3.1 years↓
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn.""
Precinct Captain70%
$0.24↓#11137↓0.25↓13.9 years↓
"Whenever this creature deals combat damage to a player, create a 1/1 white Soldier creature token."
Fungus Sliver70%
$0.49↓#13366↓0.3319.9 years↓
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""