Karn, Legacy Reforged 
Legendary Artifact Creature — Golem
$18.59 #2526 0.48 3.4 years
Karn's power and toughness are each equal to the greatest mana value among artifacts you control.
At the beginning of your upkeep, add 
for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.
for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.Click a line or tag to filter
Cards similar to Karn, Legacy Reforged 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.
Ancient Ooze86%
$1.47↓#15610↓0.14↓23.4 years↑
"this card's power and toughness are each equal to the total mana value of other creatures you control."
Towering Gibbon81%
$0.36↓#12239↓0.00↓3.9 years
"this card's power is equal to the greatest mana value among creatures you control."
Kraven, Proud Predator81%
$0.18↓#18235↓0.471.1 years↓
"this card's power is equal to the greatest mana value among permanents you control."
Monstrous War-Leech77%
$0.07↓#26284↓0.00↓4.1 years
"this card's power and toughness are each equal to the greatest mana value among cards in your graveyard."
Thran Turbine76%
$3.60↓#10553↓0.19↓28.0 years↑
"At the beginning of your upkeep, you may add . This mana can't be spent to cast spells."
. This mana can't be spent to cast spells."
The Mightstone and Weakstone76%
$4.26↓#3056↓0.11↓3.9 years
"
: Add . This mana can't be spent to cast nonartifact spells."
: Add . This mana can't be spent to cast nonartifact spells."
Gaea's Avenger76%
$45.87↑#26772↓0.29↓32.6 years↑
"this card's power and toughness are each equal to 1 plus the number of artifacts your opponents control."
Daretti, Rocketeer Engineer75%
$0.19↓#8200↓0.31↓1.7 years↓
"this card's power is equal to the greatest mana value among artifacts you control."
Hydraulic Helper75%
$0.12↓#17630↓0.22↓0.3 years↓
": Add 
. This mana can't be spent to cast a nonartifact spell."
: Add . This mana can't be spent to cast a nonartifact spell."
Darksteel Juggernaut75%
$0.42↓#4580↓0.09↓16.1 years↑
"this card's power and toughness are each equal to the number of artifacts you control."
Broodstar74%
$0.25↓#9485↓0.16↓23.0 years↑
"this card's power and toughness are each equal to the number of artifacts you control."
Living Lore74%
$0.13↓#23939↓0.24↓11.6 years↑
"this card's power and toughness are each equal to the exiled card's mana value."
Master of Etherium74%
$0.26↓#21450.18↓18.0 years↑
"this card's power and toughness are each equal to the number of artifacts you control."
Karolina Dean, Runaway72%
$3.66↓#18315↓0.25↓0.3 years↓
"At the beginning of your first main phase, add 
. This mana can't be spent to cast spells from your hand."
. This mana can't be spent to cast spells from your hand."
Dodgy Jalopy72%
$0.26↓#17759↓0.06↓4.5 years↑
"this card's power is equal to the greatest mana value among creatures you control."
Blinkmoth Urn72%
$0.92↓#5884↓0.18↓23.0 years↑
"At the beginning of each player's first main phase, if this artifact is untapped, that player adds for each artifact they control."
for each artifact they control."
Mishra's Workshop72%
$3699.99↑#3678↓1.60↑32.6 years↑
": Add . Spend this mana only to cast artifact spells."
: Add . Spend this mana only to cast artifact spells."
Battery Bearer71%
$0.14↓#25953↓0.00↓3.9 years
"Creatures you control have ": Add . This mana can't be spent to cast a nonartifact spell.""
: Add . This mana can't be spent to cast a nonartifact spell.""+1 more matching line
Emissary Escort71%
$0.19↓#9002↓0.00↓1.2 years↓
"This creature gets +X/+0, where X is the greatest mana value among other artifacts you control."
Smoky Lounge // Misty Salon70%
$0.14↓#11257↓0.00↓2.1 years↓
"At the beginning of your first main phase, add . Spend this mana only to cast Room spells and unlock doors."
. Spend this mana only to cast Room spells and unlock doors."