Elaborate Firecannon {2}
Artifact
This artifact doesn't untap during your untap step.
{4}, {T}: This artifact deals 2 damage to any target.
At the beginning of your upkeep, you may discard a card. If you do, untap this artifact.
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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.
Mana Vault 100%
$113.72#145
"This artifact doesn't untap during your untap step."
+1 more matching line
Zelyon Sword 95%
$0.86#30405
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Endoskeleton 95%
$0.22#27874
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Spirit Shield 95%
$0.46#31083
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Tawnos's Weaponry 95%
#31343
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Ashnod's Battle Gear 95%
$0.20#30335
"You may choose not to untap this artifact during your untap step."
Vedalken Shackles 95%
$7.66#11447
"You may choose not to untap this artifact during your untap step."
Deserter's Quarters 95%
$0.05#29280
"You may choose not to untap this artifact during your untap step."
Helm of Possession 95%
$5.07#14749
"You may choose not to untap this artifact during your untap step."