Treasure Nabber 
Creature — Goblin Rogue
$2.17 #1462 0.92 8.1 years
Whenever an opponent taps an artifact for mana, gain control of that artifact until the end of your next turn.
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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.