Persistent Marshstalker {1}{B}
Creature — Rat Berserker
This creature gets +1/+0 for each other Rat you control.
Threshold — Whenever you attack with one or more Rats, if there are seven or more cards in your graveyard, you may pay {2}{B}. If you do, return this card from your graveyard to the battlefield tapped and attacking.
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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.
Interceptor, Shadow's Hound 93%
$0.34#11227
"Whenever you attack with one or more legendary creatures, you may pay {2}{B}. If you do, return this card from your graveyard to the battlefield tapped and attacking."
Warcry Phoenix 91%
$0.30#17153
"Whenever you attack with three or more creatures, you may pay {2}{R}. If you do, return this card from your graveyard to the battlefield tapped and attacking."
Grim Reaper, Lethal Legionnaire 83%
$0.20#23032
"Whenever this card attacks, you may pay {3}{B}. When you do, return target creature card from your graveyard to the battlefield tapped and attacking with a finality counter on it."
Alesha, Who Smiles at Death 81%
$0.17#6096
"Whenever this card attacks, you may pay {W/B}{W/B}. If you do, return target creature card with power 2 or less from your graveyard to the battlefield tapped and attacking."