Crypt Champion 

Creature — Zombie
Double strike
When this creature enters, each player puts a creature card with mana value 3 or less from their graveyard onto the battlefield.
When this creature enters, sacrifice it unless {R} was spent to cast it.
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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.
Balduvian Horde 81%
$0.05#28476
"When this creature enters, sacrifice it unless you discard a card at random."
Minotaur Explorer 81%
$0.27#29926
"When this creature enters, sacrifice it unless you discard a card at random."
Pillaging Horde 81%
#30546
"When this creature enters, sacrifice it unless you discard a card at random."