Mindless Null {2}{B}
Creature — Zombie
This creature can't block unless you control a Vampire.
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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.
Mogg Toady 90%
$0.11#30572
"This creature can't block unless you control more creatures than attacking player."
Goblin Goon 90%
$0.35#20282
"This creature can't block unless you control more creatures than attacking player."
Marauding Boneslasher 89%
$0.04#27742
"This creature can't block unless you control another Zombie."
Howlpack Wolf 89%
$0.07#27541
"This creature can't block unless you control another Wolf or Werewolf."