Greenhouse // Rickety Gazebo 
// 

Enchantment — Room // Enchantment — Room
Lands you control have "{T}: Add one mana of any color."
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
When you unlock this door, mill four cards, then return up to two permanent cards from among them to your hand.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
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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.
Mystic Skull // Mystic Monstrosity 100%
$0.14#16293
"Lands you control have "{T}: Add one mana of any color.""
The World Tree 87%
$5.67#801
"As long as you control six or more lands, lands you control have "{T}: Add one mana of any color.""
Resonating Lute 85%
$1.53#3793
"Lands you control have "{T}: Add two mana of any one color. Spend this mana only to cast instant and sorcery spells.""
Divergent Growth 80%
$0.13#26224
"Until end of turn, lands you control gain "{T}: Add one mana of any color.""