Nether Spirit {1}{B}{B}
Creature — Spirit
At the beginning of your upkeep, if this card is the only creature card in your graveyard, you may return this card to the battlefield.
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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.
Ichorid 87%
$0.61#22667
"At the beginning of your upkeep, if this card is in your graveyard, you may exile a black creature card other than this card from your graveyard. If you do, return this card to the battlefield."
Myr Servitor 87%
$0.12#20375
"At the beginning of your upkeep, if this creature is on the battlefield, each player returns all cards named this card from their graveyard to the battlefield."
All Hallow's Eve 86%
#20928
"At the beginning of your upkeep, if this card is exiled with a scream counter on it, remove a scream counter from it. If there are no more scream counters on it, put it into your graveyard and each player returns all creature cards from their graveyard to the battlefield."