Arena of Glory
Land
This land enters tapped unless you control a Mountain.
{T}: Add {R}.
{R}, {T}, Exert this land: Add {R}{R}. If that mana is spent on a creature spell, it gains haste until end of turn. (An exerted permanent won't untap during your next untap step.)
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Cards that do something similar 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.
Castle Embereth 100%
$0.32#1055
"This land enters tapped unless you control a Mountain."
+2 more matching lines
Clifftop Retreat 97%
$0.17#82
"This land enters tapped unless you control a Mountain or a Plains."
+1 more matching line
Rootbound Crag 94%
$0.24#127
"This land enters tapped unless you control a Mountain or a Forest."
+1 more matching line
Dwarven Mine 92%
$0.34#3056
"This land enters tapped unless you control three or more other Mountains."
Rocky Roads 83%
$0.20#10678
"This land enters tapped unless you control a Mount or Vehicle."
+2 more matching lines
Dragonskull Summit 83%
$0.33#86
"This land enters tapped unless you control a Swamp or a Mountain."
+1 more matching line