Longhorn Firebeast 
Creature — Elemental Ox Beast
$0.17 #27528 0.05 24.7 years
When this creature enters, any opponent may have it deal 5 damage to them. If a player does, sacrifice this creature.
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Cards similar to Longhorn Firebeast 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.
Vexing Devil100%
$0.42↑#11734↑0.1014.5 years↓
"When this creature enters, any opponent may have it deal 4 damage to them. If a player does, sacrifice this creature."
Demanding Dragon84%
$0.24↑#7902↑0.29↑8.3 years↓
"When this creature enters, it deals 5 damage to target opponent unless that player sacrifices a creature of their choice."
Prowling Pangolin84%
$0.05↓#306290.25↑24.0 years
"When this creature enters, any player may sacrifice two creatures of their choice. If a player does, sacrifice this creature."
Dwarven Scorcher80%
$0.35↑#10142↑0.0624.4 years
"Sacrifice this creature: This creature deals 1 damage to target creature unless that creature's controller has this creature deal 2 damage to them."
Browbeat80%
$0.33↑#9590↑0.28↑24.4 years
"Any player may have this card deal 5 damage to them. If no one does, target player draws three cards."
Blazing Salvo78%
$0.16↓#17739↑0.1125.1 years
"this card deals 3 damage to target creature unless that creature's controller has this card deal 5 damage to them."
Book Burning74%
$0.17#225310.26↑24.4 years
"Any player may have this card deal 6 damage to them. If no one does, target player mills six cards."
Rhystic Lightning74%
$0.14↓#268080.0526.4 years↑
"this card deals 4 damage to any target unless that permanent's controller or that player pays . If they do, this card deals 2 damage to the permanent or player."
. If they do, this card deals 2 damage to the permanent or player."
Argothian Wurm73%
$2.69↑#21661↑0.0728.0 years↑
"When this creature enters, any player may sacrifice a land of their choice. If a player does, put this creature on top of its owner's library."
Shivan Wumpus73%
$0.37↑#245320.45↑19.7 years↓
"When this creature enters, any player may sacrifice a land of their choice. If a player does, put this creature on top of its owner's library."
Dwarven Driller71%
$0.46↑#17775↑0.31↑24.4 years
"
: Destroy target land unless its controller has this creature deal 2 damage to them."
: Destroy target land unless its controller has this creature deal 2 damage to them."
Star Athlete70%
$0.88↑#4972↑0.152.1 years↓
"Whenever this creature attacks, choose up to one target nonland permanent. Its controller may sacrifice it. If they don't, this creature deals 5 damage to that player."