Living Brain, Mechanical Marvel 
Legendary Artifact Creature — Robot Villain
$0.12 #16083 0.29 1.1 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%
$0.46↑#179490.06↓1.1 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%
$0.06↓#22305↓0.00↓8.3 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%
$0.16↑#24069↓0.353.9 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↑#21091↓0.12↓3.7 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%
$0.20↑#10361↑0.04↓8.5 years↑
"At the beginning of your end step, untap target artifact."
Tezzeret the Seeker76%
$23.06↑#1771↑0.60↑18.0 years↑
"−5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn."
Ensoul Artifact76%
$0.28↑#186480.12↓12.3 years↑
"Enchanted artifact is a creature with base power and toughness 5/5 in addition to its other types."
Synthesizer Labship75%
$0.24↑#11182↑0.05↓1.2 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%
$0.36↑#8573↑0.264.7 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."
Mind Transfer Protocol75%
$0.09↓#20465↓0.270.6 years
"Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/5."
Alloy Animist75%
$0.18↑#23115↓0.00↓3.9 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%
$0.41↑#146110.270.6 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."
Karn's Touch74%
$0.42↑#27127↓0.00↓27.0 years↑
"Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
Workshop Elders74%
$0.22↑#152020.18↓7.0 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."
Rise and Shine73%
$0.36↑#3670↑0.245.5 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."
Iron Man, Futurist Paragon72%
$1.05↑#170540.54↑0.3 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."
The Blackstaff of Waterdeep72%
$0.18↑#20487↓0.205.2 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."
Lifecraft Awakening72%
$0.07↓#24979↓0.06↓9.7 years↑
"Put X +1/+1 counters on target artifact you control. If it isn't a creature or Vehicle, it becomes a 0/0 Construct artifact creature."
Tezzeret, Cruel Captain72%
$19.19↑#1167↑0.70↑1.2 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%
$0.13↑#22187↓0.05↓3.9 years↑
"Enchanted artifact is a creature with base power and toughness 4/4 in addition to its other types."