Sly Requisitioner {4}{B}
Creature — Human Artificer
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Whenever a nontoken artifact you control is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token.
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Cards that do something similar expected a card that isn't here?
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Hidden Stockpile 82%
$0.37#7798
"At the beginning of your end step, if a permanent left the battlefield under your control this turn, create a 1/1 colorless Servo artifact creature token."
Oni-Cult Anvil 80%
$0.25#6031
"Whenever one or more artifacts you control leave the battlefield during your turn, create a 1/1 colorless Construct artifact creature token. This ability triggers only once each turn."