Rakdos Riteknife 
Artifact — Equipment
$0.37 #25113 0.31 20.5 years
Equipped creature gets +1/+0 for each blood counter on this Equipment and has "
, Sacrifice a creature: Put a blood counter on Rakdos Riteknife."
Equip 
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Cards similar to Rakdos Riteknife 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.
Misguided Rage76%
$0.15↓#298190.06↓23.4 years↑
"Target player sacrifices a permanent of their choice."
Goblin Firebomb76%
$0.10↓#18571↑0.00↓3.9 years↓
"
,
, Sacrifice this artifact: Destroy target permanent."
Eye of Doom75%
$0.22↓#229750.21↓13.0 years↓
"
,
, Sacrifice this artifact: Destroy each permanent with a doom counter on it."
Tyrant of Discord73%
$2.56↑#12060↑0.94↑14.5 years↓
"When this creature enters, target opponent chooses a permanent they control at random and sacrifices it. If a nonland permanent is sacrificed this way, repeat this process."
Silverclad Ferocidons72%
$0.94↑#5385↑0.69↑8.8 years↓
"Whenever this creature is dealt damage, each opponent sacrifices a permanent of their choice."
Recantation71%
$0.40↑#279880.12↓28.0 years↑
"
, Sacrifice this enchantment: Return up to X target permanents to their owners' hands, where X is the number of verse counters on this enchantment."
Akki Underminer70%
$0.21↓#234700.2522.1 years↑
"Whenever this creature deals combat damage to a player, that player sacrifices a permanent of their choice."
Universal Solvent70%
$0.10↓#18804↑0.00↓9.7 years↓
"
,
, Sacrifice this artifact: Destroy target permanent."
Smokestack70%
$1.09↑#8634↑2.22↑28.0 years↑
"At the beginning of each player's upkeep, that player sacrifices a permanent of their choice for each soot counter on this artifact."
Unstable Obelisk70%
$0.13↓#5057↑0.04↓12.0 years↓
"
,
, Sacrifice this artifact: Destroy target permanent."