Living Brain, Mechanical Marvel 
Legendary Artifact Creature — Robot Villain
$0.21 #16118 0.38 1.0 years
At the beginning of combat on your turn, target non-Equipment artifact you control becomes an artifact creature with base power and toughness 3/3 until end of turn. Untap it.
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Cards similar to Living Brain, Mechanical Marvel 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.
Doc Ock, Evil Inventor84%
$0.52↑#177920.400.9 years
"At the beginning of combat on your turn, target noncreature artifact you control becomes an 8/8 Robot Villain artifact creature in addition to its other types."
Skilled Animator82%
$0.05↓#21988↓0.12↓8.1 years↑
"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."
Tawnos's Tinkering79%
$0.10↓#23727↓0.27↓3.8 years↑
"Put two +1/+1 counters on target artifact, creature, or land you control. Untap that permanent. If it isn't a creature, it becomes a 0/0 creature in addition to its other types."
Unctus's Retrofitter76%
$0.19↓#20883↓0.26↓3.6 years↑
"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."
Voltaic Servant76%
$0.22↑#10321↑0.20↓8.4 years↑
"At the beginning of your end step, untap target artifact."
Mind Transfer Protocol76%
$0.12↓#20760↓0.00↓0.5 years
"Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/5."
Tezzeret the Seeker76%
$22.78↑#1730↑0.70↑17.9 years↑
"−5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn."
Ensoul Artifact76%
$0.29↑#184370.4012.1 years↑
"Enchanted artifact is a creature with base power and toughness 5/5 in addition to its other types."
Synthesizer Labship75%
$0.25↑#11358↑0.10↓1.1 years
"At the beginning of combat on your turn, up to one other target artifact you control becomes an artifact creature with base power and toughness 2/2 and gains flying until end of turn."
Katsumasa, the Animator75%
$0.37↑#8375↑0.354.5 years↑
"
: Until end of turn, target noncreature artifact you control becomes an artifact creature and gains flying. If it's not a Vehicle, it has base power and toughness 1/1 until end of turn."
: Until end of turn, target noncreature artifact you control becomes an artifact creature and gains flying. If it's not a Vehicle, it has base power and toughness 1/1 until end of turn."
Alloy Animist74%
$0.16↓#22818↓0.00↓3.8 years↑
"
: Until end of turn, target noncreature artifact you control becomes a 4/4 artifact creature."
: Until end of turn, target noncreature artifact you control becomes a 4/4 artifact creature."
Does Machines74%
$0.49↑#150130.00↓0.5 years
"At the beginning of combat on your turn, put three +1/+1 counters on target artifact you control. If it isn't a creature, it becomes a 0/0 Robot creature in addition to its other types."
Rise and Shine74%
$0.34↑#3619↑0.17↓5.3 years↑
"Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on each artifact that became a creature this way."
Karn's Touch74%
$0.39↑#26872↓0.53↑26.9 years↑
"Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
Workshop Elders74%
$0.18↓#148710.366.9 years↑
"At the beginning of combat on your turn, you may have target noncreature artifact you control become a 0/0 artifact creature. If you do, put four +1/+1 counters on it."
The Blackstaff of Waterdeep72%
$0.15↓#20141↓0.305.1 years↑
"
, 
: Another target nontoken artifact you control becomes a 4/4 artifact creature for as long as this card remains tapped. Activate only as a sorcery."
, : Another target nontoken artifact you control becomes a 4/4 artifact creature for as long as this card remains tapped. Activate only as a sorcery."
Iron Man, Futurist Paragon72%
$1.91↑#179540.00↓0.2 years
"At the beginning of combat on your turn, target artifact or creature becomes an artifact creature with base power and toughness 5/5 and gains flying."
Tezzeret, Cruel Captain72%
$19.21↑#1256↑0.70↑1.1 years
"−7: You get an emblem with "At the beginning of combat on your turn, put three +1/+1 counters on target artifact you control. If it's not a creature, it becomes a 0/0 Robot artifact creature.""
Mightstone's Animation72%
$0.11↓#21985↓0.16↓3.8 years↑
"Enchanted artifact is a creature with base power and toughness 4/4 in addition to its other types."
The Antiquities War72%
$0.31↑#11831↑0.50↑8.4 years↑
"Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn."