Donatello, Mutant Mechanic 
Legendary Creature — Mutant Ninja Turtle
$0.94 #13048 0.59 0.6 years
: 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. Activate only as a sorcery.Whenever an artifact you control is put into a graveyard from the battlefield, if it had counters on it, put those counters on up to one target artifact or creature you control.
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Cards similar to Donatello, Mutant Mechanic 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.
Yuna, Grand Summoner88%
$0.39↓#3503↑0.541.4 years
"Whenever another permanent you control is put into a graveyard from the battlefield, if it had one or more counters on it, you may put that number of +1/+1 counters on target creature."
Rise and Shine84%
$0.36↓#3670↑0.24↓5.5 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."
Workshop Elders82%
$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."
Does Machines80%
$0.41↓#146110.27↓0.6 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."
Alloy Animist80%
$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."
Lifecraft Awakening80%
$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."
Host of the Hereafter79%
$0.29↓#7657↑0.10↓1.5 years
"Whenever this creature or another creature you control dies, if it had counters on it, put its counters on up to one target creature you control."
Doc Ock, Evil Inventor78%
$0.46↓#17949↓0.06↓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."
Judge Magister Gabranth78%
$0.19↓#9166↑0.25↓1.4 years
"Whenever another creature or artifact you control dies, put a +1/+1 counter on this card."
Katsumasa, the Animator78%
$0.36↓#8573↑0.26↓4.7 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."+1 more matching line
Moriok Rigger77%
$0.50↓#24413↓0.00↓22.4 years↑
"Whenever an artifact is put into a graveyard from the battlefield, you may put a +1/+1 counter on this creature."
The Blackstaff of Waterdeep76%
$0.18↓#20487↓0.20↓5.2 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."
Ensoul Artifact76%
$0.28↓#18648↓0.12↓12.3 years↑
"Enchanted artifact is a creature with base power and toughness 5/5 in addition to its other types."
Animating Faerie // Bring to Life75%
$0.22↓#19386↓0.00↓7.0 years↑
"Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on it."
Tough Cookie75%
$0.24↓#6799↑0.00↓3.1 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."
Buzzard-Wasp Colony75%
$0.10↓#151810.07↓0.9 years
"Whenever another creature you control dies, if it had counters on it, put its counters on this creature."
Blaster, Combat DJ // Blaster, Morale Booster74%
$0.78↓#140520.82↑3.9 years↑
"
, : Move X +1/+1 counters from this card onto another target artifact. That artifact gains haste until end of turn. If this card has no +1/+1 counters on it, convert it. Activate only as a sorcery."
, : Move X +1/+1 counters from this card onto another target artifact. That artifact gains haste until end of turn. If this card has no +1/+1 counters on it, convert it. Activate only as a sorcery."
Tezzeret, Cruel Machinist74%
$1.09↑#22325↓0.19↓8.3 years↑
"0: Until your next turn, target artifact you control becomes a 5/5 creature in addition to its other types."
Tezzeret, Cruel Captain74%
$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.""
Ultron's Auxiliary73%
$0.99↑#19437↓0.12↓0.3 years
"Whenever another artifact is put into your graveyard from the battlefield or an artifact card is put into your graveyard from anywhere other than the battlefield, put a +1/+1 counter on this creature."