Karn, the Great Creator 
Legendary Planeswalker — Karn
$2.65 #2079 1.61 7.3 years
Activated abilities of artifacts your opponents control can't be activated.
+1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.
−2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile. Put that card into your hand.
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Cards similar to Karn, the Great Creator 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.
Stony Silence86%
$0.50↓#6106↓1.35↓14.9 years↑
"Activated abilities of artifacts can't be activated."
Collector Ouphe84%
$2.20↓#24311.557.2 years
"Activated abilities of artifacts can't be activated."
Xenic Poltergeist82%
$0.62↓#20185↓0.00↓32.5 years↑
"
: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value."
: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value."
Null Rod82%
$113.87↑#8938↓1.5329.2 years↑
"Activated abilities of artifacts can't be activated."
Damping Matrix82%
$0.72↓#15507↓1.25↓22.9 years↑
"Activated abilities of artifacts and creatures can't be activated unless they're mana abilities."
Karn's Touch80%
$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."
Karn, Silver Golem78%
$16.57↑#11718↓0.35↓27.9 years↑
"
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
Sydri, Galvanic Genius77%
$0.85↓#14715↓0.09↓12.8 years↑
"
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
Toymaker75%
$0.23↓#19782↓0.36↓26.9 years↑
", , Discard a card: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
, , Discard a card: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
Titania's Song74%
$0.66↓#16386↓0.41↓32.5 years↑
"Each noncreature artifact loses all abilities and becomes an artifact creature with power and toughness each equal to its mana value. If this enchantment leaves the battlefield, this effect continues until end of turn."
March of the Machines74%
$0.53↓#14424↓0.24↓22.9 years↑
"Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value."
Clarion Conqueror74%
$1.87↓#6418↓1.10↓1.4 years↓
"Activated abilities of artifacts, creatures, and planeswalkers can't be activated."
Animate Artifact73%
$0.22↓#25963↓0.05↓33.1 years↑
"As long as enchanted artifact isn't a creature, it's an artifact creature with power and toughness each equal to its mana value."
Alloy Animist70%
$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."