Metalwork Colossus 
Artifact Creature — Construct
$0.34 #1691 0.17 9.9 years
This spell costs 
less to cast, where X is the total mana value of noncreature artifacts you control.
less to cast, where X is the total mana value of noncreature artifacts you control.Sacrifice two artifacts: Return this card from your graveyard to your hand.
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Cards similar to Metalwork Colossus 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.
Gollum the Abandoned82%
$0.21↓#22376↓0.00↓0.1 years↓
"
, Sacrifice an artifact or creature: Return this card from your graveyard to your hand. Activate only as a sorcery."
, Sacrifice an artifact or creature: Return this card from your graveyard to your hand. Activate only as a sorcery."
Gilded Assault Cart78%
$0.30↓#20345↓0.255.6 years↓
"Sacrifice two Treasures: Return this card from your graveyard to your hand."
Frogmite74%
$0.22↓#10020↓0.48↑22.9 years↑
"Affinity for artifacts"
Myr Enforcer74%
$0.54↑#5630↓0.00↓22.9 years↑
"Affinity for artifacts"
Frogmyr Enforcer74%
$0.30↓#8316↓0.112.2 years↓
"Affinity for artifacts"
Dutiful Griffin73%
$0.09↓#27181↓0.31↑3.0 years↓
"
, Sacrifice two enchantments: Return this card from your graveyard to your hand."
, Sacrifice two enchantments: Return this card from your graveyard to your hand."
Tymaret, the Murder King72%
$0.32↓#19505↓0.00↓12.9 years↑
"
, Sacrifice a creature: Return this card from your graveyard to your hand."
, Sacrifice a creature: Return this card from your graveyard to your hand."
Salvage Titan72%
$0.44↑#22299↓0.33↑17.9 years↑
"Exile three artifact cards from your graveyard: Return this card from your graveyard to your hand."
+1 more matching line
Earthquake Dragon72%
$4.57↑#3362↓0.224.2 years↓
"
, Sacrifice a land: Return this card from your graveyard to your hand."
, Sacrifice a land: Return this card from your graveyard to your hand."+1 more matching line
Gollum, Patient Plotter72%
$0.21↓#4408↓0.223.2 years↓
", Sacrifice a creature: Return this card from your graveyard to your hand. Activate only as a sorcery."
, Sacrifice a creature: Return this card from your graveyard to your hand. Activate only as a sorcery."
Deathless Behemoth70%
$0.14↓#20559↓0.04↓10.9 years
"Sacrifice two Eldrazi Scions: Return this card from your graveyard to your hand. Activate only as a sorcery."
Eldrazi Ravager70%
$0.25↓#9916↓1.07↑2.2 years↓
"Sacrifice two Eldrazi: Return this card from your graveyard to your hand."