Darksteel Sentinel 
Artifact Creature — Golem
$0.30 #16088 0.06 16.1 years
Flash (You may cast this spell any time you could cast an instant.)
Vigilance
Indestructible (Damage and effects that say "destroy" don't destroy this creature. If its toughness is 0 or less, it's still put into its owner's graveyard.)
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Cards similar to Darksteel Sentinel 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 Myr100%
$1.06↑#6754↑0.0016.1 years
"Indestructible"
Darksteel Gargoyle98%
$0.27↓#20908↓0.0022.7 years↑
"Indestructible"
Seraph of the Suns98%
$0.21↓#23038↓0.50↑9.5 years↓
"Indestructible"
Darksteel Relic86%
$2.06↑#8173↑0.1115.4 years
"Indestructible"
Mistvault Bridge85%
$0.70↑#1837↑0.065.3 years↓
"Indestructible"
Tanglepool Bridge85%
$0.28↓#3277↑0.055.3 years↓
"Indestructible"
Rustvale Bridge85%
$0.21↓#1244↑0.035.3 years↓
"Indestructible"
Darksteel Citadel85%
$0.42↑#284↑0.0722.7 years↑
"Indestructible"
Drossforge Bridge85%
$1.11↑#2336↑0.095.3 years↓
"Indestructible"
Thornglint Bridge85%
$0.21↓#4563↑0.065.3 years↓
"Indestructible"
Darkmoss Bridge85%
$0.31↑#2728↑0.055.3 years↓
"Indestructible"
Razortide Bridge85%
$0.25↓#1073↑0.125.3 years↓
"Indestructible"
Darksteel Axe85%
$0.22↓#133520.0016.1 years
"Indestructible"
Slagwoods Bridge85%
$0.29↓#3211↑0.025.3 years↓
"Indestructible"
Goldmire Bridge85%
$0.29↓#2316↑0.025.3 years↓
"Indestructible"
Silverbluff Bridge85%
$0.29↓#1173↑0.095.3 years↓
"Indestructible"
Vibranium Energy Daggers85%
$0.15↓#146570.20↑0.3 years↓
"Indestructible"
Sapling of Colfenor82%
$6.01↑#6711↑0.0618.2 years↑
"Indestructible"
Darksteel Brute82%
$0.17↓#24749↓0.0022.7 years↑
"Indestructible"
Darksteel Colossus81%
$0.85↑#2310↑0.55↑22.7 years↑
"Indestructible"