Longhorn Firebeast 
Creature — Elemental Ox Beast
$0.12 #27177 0.00 24.6 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↑#11595↑0.0914.3 years↓
"When this creature enters, any opponent may have it deal 4 damage to them. If a player does, sacrifice this creature."
Demanding Dragon84%
$0.23↑#7741↑0.35↑8.1 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↓#303970.24↑23.9 years
"When this creature enters, any player may sacrifice two creatures of their choice. If a player does, sacrifice this creature."
Dwarven Scorcher80%
$0.26↑#9935↑0.0724.3 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↑#9361↑0.0024.3 years
"Any player may have this card deal 5 damage to them. If no one does, target player draws three cards."
Blazing Salvo77%
$0.17↑#17842↑0.0024.9 years
"this card deals 3 damage to target creature unless that creature's controller has this card deal 5 damage to them."
Book Burning74%
$0.19↑#222810.27↑24.3 years
"Any player may have this card deal 6 damage to them. If no one does, target player mills six cards."
Rhystic Lightning74%
$0.13↑#266210.17↑26.3 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."
Shivan Wumpus73%
$0.33↑#241650.0019.6 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."
Argothian Wurm73%
$2.54↑#21288↑0.0027.9 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%
$0.49↑#17405↑0.65↑24.3 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%
$0.91↑#4750↑0.15↑1.9 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."