Geist of the Lonely Vigil 

Creature — Spirit Cleric
Defender, flying
Delirium — This creature can attack as though it didn't have defender as long as there are four or more card types among cards in your graveyard.
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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.
Ogre Jailbreaker 100%
$0.03#27254
"This creature can attack as though it didn't have defender as long as you control a Gate."
Slithering Shade 100%
$0.08#28698
"This creature can attack as though it didn't have defender as long as you have no cards in hand."
Chaos Lord 90%
$0.52#26305
"This creature can attack as though it had haste unless it entered this turn."
Bloodcrazed Goblin 90%
$0.18#25197
"This creature can't attack unless an opponent has been dealt damage this turn."
Goblin Cohort 89%
$0.24#24308
"This creature can't attack unless you've cast a creature spell this turn."
Mogg Conscripts 89%
#27105
"This creature can't attack unless you've cast a creature spell this turn."
Silburlind Snapper 85%
$0.04#26997
"This creature can't attack unless you've cast a noncreature spell this turn."
Scarred Puma 85%
$0.08#31128
"This creature can't attack unless a black or green creature also attacks."
Mogg Toady 85%
$0.11#30572
"This creature can't attack unless you control more creatures than defending player."
Goblin Goon 85%
$0.35#20282
"This creature can't attack unless you control more creatures than defending player."
Orcish Conscripts 84%
#30294
"This creature can't attack unless at least two other creatures attack."