Furnace Scamp {R}
Creature — Phyrexian Beast
Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, this creature deals 3 damage to that player.
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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.
Cacophony Scamp 92%
$0.28#11681
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, proliferate."
Haunted Cadaver 91%
$0.12#27339
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, that player discards three cards."
Aspiring Champion 90%
$0.45#9774
"When this creature deals combat damage to a player, sacrifice it. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield, then shuffle the rest into your library. If that creature is a Demon, it deals damage equal to its power to each opponent."
Impaler Shrike 89%
$0.11#19839
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, draw three cards."
Greater Harvester 88%
$1.71#13056
"Whenever this creature deals combat damage to a player, that player sacrifices two permanents of their choice."
Living Lore 87%
$0.10#23263
"Whenever this creature deals combat damage, you may sacrifice it. If you do, you may cast the exiled card without paying its mana cost."
Demon of Loathing 87%
$0.46#8186
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Cabal Executioner 87%
$0.21#25603
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Servant of the Stinger 83%
$0.22#10122
"Whenever this creature deals combat damage to a player, if you've committed a crime this turn, you may sacrifice this creature. If you do, search your library for a card, put it into your hand, then shuffle."
Riptide Entrancer 81%
$1.41#17917
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, gain control of target creature that player controls."
Akki Underminer 81%
$0.15#22722
"Whenever this creature deals combat damage to a player, that player sacrifices a permanent of their choice."
Dauthi Mindripper 80%
$0.26#22949
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Mindstab Thrull 80%
#26488
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."