Ruthless Deathfang 
Creature — Dragon
$0.15 #18044 0.18 11.4 years
Flying
Whenever you sacrifice a creature, target opponent sacrifices a creature of their choice.
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Cards similar to Ruthless Deathfang 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.
Savra, Queen of the Golgari84%
$3.07↑#6028↑0.31↑20.9 years↑
"Whenever you sacrifice a black creature, you may pay 2 life. If you do, each other player sacrifices a creature of their choice."
Smothering Abomination80%
$0.33↑#3833↑0.28↑10.9 years
"At the beginning of your upkeep, sacrifice a creature."
Ashling, the Extinguisher78%
$29.66↑#13817↑0.29↑18.1 years↑
"Whenever this card deals combat damage to a player, choose target creature that player controls. The player sacrifices that creature."
Demon of Loathing78%
$0.61↑#8297↑0.126.6 years↓
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Mayhem Devil78%
$0.34↑#572↑0.60↑7.3 years↓
"Whenever a player sacrifices a permanent, this creature deals 1 damage to any target."
Mirkwood Bats78%
$1.45↑#228↑0.73↑3.2 years↓
"Whenever you create or sacrifice a token, each opponent loses 1 life."
+1 more matching line
Riveteers Ascendancy77%
$0.56↑#4268↑0.28↑4.4 years↓
"Whenever you sacrifice a creature, you may return target creature card with lesser mana value from your graveyard to the battlefield tapped. Do this only once each turn."
Thraximundar76%
$0.79↑#8992↑0.84↑17.3 years↑
"Whenever this card attacks, defending player sacrifices a creature of their choice."
Predatory Nightstalker76%
$0.06↓#31049↓0.50↑28.2 years↑
"When this creature enters, you may have target opponent sacrifice a creature of their choice."
Chittering Harvester75%
$0.21↑#8941↑0.33↑6.4 years↓
"Whenever this creature mutates, each opponent sacrifices a creature of their choice."
Cabal Executioner75%
$0.18↑#26087↓0.29↑23.9 years↑
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Shivan Hellkite74%
$0.26↑#194600.29↑27.9 years↑
"Flying"
Witch-king, Bringer of Ruin74%
$11.62↑#7412↑0.31↑3.2 years↓
"Whenever this card attacks, defending player sacrifices a creature with the least power among creatures they control."
Chainer's Edict73%
$0.18↑#145870.47↑24.6 years↑
"Target player sacrifices a creature of their choice."
Crude Bent Blade73%
$0.11↓#21663↓0.00↓0.1 years↓
"When this Equipment enters, target opponent sacrifices a creature of their choice."
Freewind Equenaut72%
$0.11↓#28202↓0.2221.0 years↑
"Flying"
Sheoldred, Whispering One72%
$18.57↑#715↑1.52↑15.3 years↑
"At the beginning of each opponent's upkeep, that player sacrifices a creature of their choice."
Soratami Mirror-Mage72%
$0.20↑#173640.00↓21.9 years↑
"Flying"
Somnophore72%
$0.46↑#25922↓0.1127.9 years↑
"Flying"
Necropolis Fiend72%
$0.19↑#174260.1511.9 years
"Flying"