Darksteel Monolith 
Artifact
$25.50 #2360 0.98 3.2 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 Relic94%
$2.06↓#8173↓0.11↓15.4 years↑
"Indestructible"
Mistvault Bridge94%
$0.70↓#1837↑0.06↓5.3 years↑
"Indestructible"
Tanglepool Bridge94%
$0.28↓#3277↓0.05↓5.3 years↑
"Indestructible"
Rustvale Bridge94%
$0.21↓#1244↑0.03↓5.3 years↑
"Indestructible"
Darksteel Citadel94%
$0.42↓#284↑0.07↓22.7 years↑
"Indestructible"
Drossforge Bridge94%
$1.11↓#23360.09↓5.3 years↑
"Indestructible"
Thornglint Bridge94%
$0.21↓#4563↓0.06↓5.3 years↑
"Indestructible"
Darkmoss Bridge94%
$0.31↓#27280.05↓5.3 years↑
"Indestructible"
Razortide Bridge94%
$0.25↓#1073↑0.12↓5.3 years↑
"Indestructible"
Darksteel Axe94%
$0.22↓#13352↓0.00↓16.1 years↑
"Indestructible"
Slagwoods Bridge94%
$0.29↓#3211↓0.02↓5.3 years↑
"Indestructible"
Goldmire Bridge94%
$0.29↓#23160.02↓5.3 years↑
"Indestructible"
Silverbluff Bridge94%
$0.29↓#1173↑0.09↓5.3 years↑
"Indestructible"
Vibranium Energy Daggers94%
$0.15↓#14657↓0.20↓0.3 years↓
"Indestructible"
Darksteel Brute88%
$0.17↓#24749↓0.00↓22.7 years↑
"Indestructible"
Darksteel Plate87%
$2.95↓#912↑0.37↓15.7 years↑
"Indestructible"
Nutrient Block86%
$0.26↓#6229↓0.00↓1.2 years↓
"Indestructible"
Captain America's Shield84%
$1.97↓#5023↓0.43↓0.3 years↓
"Indestructible"
Darksteel Ingot84%
$0.17↓#20990.00↓22.8 years↑
"Indestructible"
Cascading Cataracts84%
$1.80↓#1209↑0.14↓9.5 years↑
"Indestructible"