Hargilde, Kindly Runechanter 
Legendary Creature — Human
$0.37 #16908 0.00 4.9 years
: Add 
. Spend this mana only to cast artifact spells or activate abilities of artifacts.Partner—Friends forever (You can have two commanders if both have this ability.)
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Cards similar to Hargilde, Kindly Runechanter 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.
Steelswarm Operator98%
$0.23↓#9262↑0.081.1 years↓
": Add . Spend this mana only to cast an artifact spell."
: Add . Spend this mana only to cast an artifact spell."
Soldevi Machinist98%
$0.26↓#27664↓0.0031.3 years↑
": Add . Spend this mana only to activate abilities of artifacts."
: Add . Spend this mana only to activate abilities of artifacts."
Purple Dragon Punks97%
$0.09↓#21801↓0.000.5 years↓
": Add 
. Spend this mana only to cast an artifact spell or to activate an ability."
: Add . Spend this mana only to cast an artifact spell or to activate an ability."
Guidelight Optimizer97%
$0.21↓#11026↑0.21↑1.6 years↓
": Add . Spend this mana only to cast an artifact spell or activate an ability."
: Add . Spend this mana only to cast an artifact spell or activate an ability."
Vedalken Engineer96%
$0.17↓#5982↑0.22↑22.6 years↑
": Add two mana of any one color. Spend this mana only to cast artifact spells or activate abilities of artifacts."
: Add two mana of any one color. Spend this mana only to cast artifact spells or activate abilities of artifacts."
Dalakos, Crafter of Wonders96%
$0.36↓#7058↑0.006.6 years↑
": Add . Spend this mana only to cast artifact spells or activate abilities of artifacts."
: Add . Spend this mana only to cast artifact spells or activate abilities of artifacts."
Omen Hawker94%
$0.36↓#5016↑0.003.4 years↓
": Add . Spend this mana only to activate abilities."
: Add . Spend this mana only to activate abilities."
Renowned Weaponsmith93%
$0.08↓#147960.16↑11.6 years↑
": Add . Spend this mana only to cast artifact spells or activate abilities of artifacts."
: Add . Spend this mana only to cast artifact spells or activate abilities of artifacts."
Mishra's Workshop92%
$3249.99↑#3810↑1.55↑32.5 years↑
": Add . Spend this mana only to cast artifact spells."
: Add . Spend this mana only to cast artifact spells."
Oaken Siren92%
$0.26↓#10702↑0.062.8 years↓
": Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact source."
: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact source."
James, Wandering Dad // Follow Him92%
$0.32↓#8618↑0.33↑2.5 years↓
": Add . Spend this mana only to activate abilities."
: Add . Spend this mana only to activate abilities."
Somberwald Sage89%
$0.59↑#2559↑0.20↑14.3 years↑
": Add three mana of any one color. Spend this mana only to cast creature spells."
: Add three mana of any one color. Spend this mana only to cast creature spells."
Hydraulic Helper88%
$0.15↓#186520.000.2 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."
Sage of the Unknowable88%
$0.11↓#20543↓0.002.2 years↓
": Add . Spend this mana only to cast a colorless spell or to activate an ability."
: Add . Spend this mana only to cast a colorless spell or to activate an ability."
Automated Artificer88%
$0.20↓#9007↑0.40↑4.5 years
": Add . Spend this mana only to activate an ability or cast an artifact spell."
: Add . Spend this mana only to activate an ability or cast an artifact spell."
Cargo Ship86%
$0.20↓#10880↑0.18↑1.2 years↓
": Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact source."
: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact source."
Osgood, Operation Double86%
$0.28↓#13207↑0.40↑2.9 years↓
": Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact."
: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact."
Pit Automaton84%
$0.25↓#11949↑0.17↑1.6 years↓
": Add . Spend this mana only to activate abilities."
: Add . Spend this mana only to activate abilities."
Alena, Kessig Trapper83%
$0.19↓#7681↑0.25↑5.8 years
"Partner"
Castle Garenbrig82%
$8.30↑#720↑0.18↑6.9 years↑
"
, : Add six . Spend this mana only to cast creature spells or activate abilities of creatures."
, : Add six . Spend this mana only to cast creature spells or activate abilities of creatures."