Mirran Safehouse 
Artifact
$0.18 #17207 0.58 3.6 years
As long as this artifact is on the battlefield, it has all activated abilities of all land cards in all graveyards.
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Cards similar to Mirran Safehouse 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.
Necrotic Ooze88%
$2.41↑#4599↑0.37↓15.9 years↑
"As long as this creature is on the battlefield, it has all activated abilities of all creature cards in all graveyards."
Manascape Refractor80%
$1.55↑#11011↑0.566.4 years↑
"This artifact has all activated abilities of all lands on the battlefield."
Murasa Behemoth79%
$0.10↓#28146↓0.33↓7.2 years↑
"This creature gets +3/+3 as long as there is a land card in your graveyard."
Sharkey, Tyrant of the Shire74%
$0.24↑#200440.38↓3.2 years
"this card has all activated abilities of lands your opponents control except mana abilities."
Igneous Elemental74%
$0.05↓#30128↓0.00↓7.2 years↑
"This spell costs 
less to cast if there is a land card in your graveyard."
less to cast if there is a land card in your graveyard."
Trazyn the Infinite73%
$1.71↑#10122↑0.563.9 years
"As long as Trazyn is on the battlefield, it has all activated abilities of all artifact cards in your graveyard."
Ore-Scale Guardian70%
$0.18#27116↓0.00↓7.2 years↑
"This spell costs 
less to cast for each land card in your graveyard."
less to cast for each land card in your graveyard."
Marvin, Murderous Mimic70%
$3.37↑#1090↑0.47↓1.9 years↓
"this card has all activated abilities of creatures you control that don't have the same name as this creature."