Splitting the Powerstone {2}{U}
Sorcery
As an additional cost to cast this spell, sacrifice an artifact.
Create two tapped Powerstone tokens. If the sacrificed artifact was legendary, draw a card. (The tokens are artifacts with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")
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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.
Kuldotha Rebirth 100%
$0.43#13240
"As an additional cost to cast this spell, sacrifice an artifact."
Incendiary Sabotage 100%
$0.05#26907
"As an additional cost to cast this spell, sacrifice an artifact."
Trash for Treasure 100%
$1.44#3784
"As an additional cost to cast this spell, sacrifice an artifact."
Voltage Surge 97%
$0.13#19442
"As an additional cost to cast this spell, you may sacrifice an artifact."
Triassic Egg 90%
#25853
"Sacrifice this artifact: Choose one. Activate only if there are two or more hatchling counters on this artifact."
Oxidda Daredevil 88%
$0.03#29355
"Sacrifice an artifact: This creature gains haste until end of turn."
Dargo, the Shipwrecker 87%
$0.21#8006
"As an additional cost to cast this spell, you may sacrifice any number of artifacts and/or creatures. This spell costs {2} less to cast for each permanent sacrificed this way and {2} less to cast for each other artifact or creature you've sacrificed this turn."
Salvage Titan 83%
$0.35#21827
"You may sacrifice three artifacts rather than pay this spell's mana cost."
Slobad, Goblin Tinkerer 82%
$0.60#7449
"Sacrifice an artifact: Target artifact gains indestructible until end of turn."
Transmute Artifact 82%
#3602
"Sacrifice an artifact. If you do, search your library for an artifact card. If that card's mana value is less than or equal to the sacrificed artifact's mana value, put it onto the battlefield. If it's greater, you may pay {X}, where X is the difference. If you do, put it onto the battlefield. If you don't, put it into its owner's graveyard. Then shuffle."