Depth Charge Colossus 
Artifact Creature — Dreadnought
$0.19 #21926 0.06 3.9 years
Prototype 

— 6/6 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
This creature doesn't untap during your untap step.
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Cards similar to Depth Charge Colossus 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.
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"
: Untap this creature. Activate only during your upkeep."
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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
+1 more matching line
Brass Man92%
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"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
+1 more matching line
Goblin Sharpshooter92%
$23.77↑#3867↑0.63↑24.0 years↑
"This creature doesn't untap during your untap step."