Kuldotha Rebirth 
Sorcery
As an additional cost to cast this spell, sacrifice an artifact.
Create three 1/1 red Goblin creature tokens.
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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.
Splitting the Powerstone 100%
$0.10#21308
"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."