Faerie Artisans 

Creature — Faerie Artificer
Flying
Whenever a nontoken creature an opponent controls enters, create a token that's a copy of that creature except it's an artifact in addition to its other types. Then exile all other tokens created with this creature.
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Cards that do something similar expected a card that isn't here?
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Theoretical Duplication 90%
$0.61#6205
"Whenever a nontoken creature an opponent controls enters this turn, create a token that's a copy of that creature."
Life of the Party 87%
$11.75#5019
"When this creature enters, if it's not a token, each opponent creates a token that's a copy of it. The tokens are goaded for the rest of the game."
Kambal, Profiteering Mayor 86%
$4.97#1144
"Whenever one or more tokens your opponents control enter, for each of them, create a tapped token that's a copy of it. This ability triggers only once each turn."
Molten Echoes 84%
$10.14#2348
"Whenever a nontoken creature you control of the chosen type enters, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step."
Dual Nature 83%
$2.58#18998
"Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature."
Aboleth Spawn 82%
$8.51#3851
"Whenever a creature entering under an opponent's control causes a triggered ability of that creature to trigger, you may copy that ability. You may choose new targets for the copy."
Twilight Diviner 80%
$1.99#3533
"Whenever one or more other creatures you control enter, if they entered or were cast from a graveyard, create a token that's a copy of one of them. This ability triggers only once each turn."