Darksteel Monolith 
Artifact
$25.24 #2392 0.92 3.1 years
Indestructible
Once each turn, you may pay 
rather than pay the mana cost for a colorless spell you cast from your hand.
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Cards similar to Darksteel Monolith 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.
Darksteel Relic92%
$2.23↓#8178↓0.47↓15.3 years↑
"Indestructible"
Darksteel Axe92%
$0.21↓#13272↓0.24↓15.9 years↑
"Indestructible"
Goldmire Bridge92%
$0.33↓#22550.10↓5.2 years↑
"Indestructible"
Darksteel Citadel92%
$1.07↓#284↑0.15↓22.6 years↑
"Indestructible"
Vibranium Energy Daggers92%
$0.09↓#15910↓0.00↓0.2 years↓
"Indestructible"
Slagwoods Bridge92%
$0.32↓#3288↓0.12↓5.2 years↑
"Indestructible"
Silverbluff Bridge92%
$0.29↓#1168↑0.15↓5.2 years↑
"Indestructible"
Tanglepool Bridge92%
$0.24↓#3234↓0.12↓5.2 years↑
"Indestructible"
Drossforge Bridge92%
$1.13↓#22850.12↓5.2 years↑
"Indestructible"
Mistvault Bridge92%
$0.85↓#1805↑0.11↓5.2 years↑
"Indestructible"
Rustvale Bridge92%
$0.24↓#1232↑0.07↓5.2 years↑
"Indestructible"
Thornglint Bridge92%
$0.22↓#4505↓0.07↓5.2 years↑
"Indestructible"
Razortide Bridge92%
$0.25↓#1061↑0.16↓5.2 years↑
"Indestructible"
Darkmoss Bridge92%
$0.26↓#25870.16↓5.2 years↑
"Indestructible"
Darksteel Brute86%
$0.24↓#24534↓0.21↓22.6 years↑
"Indestructible"
Darksteel Plate84%
$4.62↓#918↑0.33↓15.6 years↑
"Indestructible"
Nutrient Block83%
$0.30↓#6432↓0.00↓1.1 years↓
"Indestructible"
Captain America's Shield82%
$0.98↓#6290↓0.00↓0.2 years↓
"Indestructible"
Darksteel Ingot82%
$0.20↓#20410.27↓22.7 years↑
"Indestructible"
Cascading Cataracts81%
$1.49↓#1214↑0.08↓9.4 years↑
"Indestructible"