Unctus's Retrofitter 

Creature — Phyrexian Artificer
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
When this creature enters, up to one target artifact you control becomes an artifact creature with base power and toughness 4/4 for as long as this creature remains on the battlefield.
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Skilled Animator 81%
$0.13#21531
"When this creature enters, target artifact you control becomes an artifact creature with base power and toughness 5/5 for as long as this creature remains on the battlefield."