Leyline Tyrant {2}{R}{R}
Creature — Dragon
Flying
You don't lose unspent red mana as steps and phases end.
When this creature dies, you may pay any amount of {R}. When you do, it deals that much damage to any target.
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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.
Electro, Assaulting Battery 100%
$5.78#1472
"You don't lose unspent red mana as steps and phases end."
The Last Agni Kai 91%
$1.76#2326
"Until end of turn, you don't lose unspent red mana as steps and phases end."
Ozai, the Phoenix King 83%
$3.65#4107
"If you would lose unspent mana, that mana becomes red instead."
Iceman and Firestar 81%
$0.50#27612
"Whenever you cast a red spell, you may discard a card. If you do, draw a card."
Pink Horror 80%
$0.86#10088
"When this creature dies, create two 2/2 blue and red Demon Horror creature tokens named Blue Horror with "Whenever you cast an instant or sorcery spell, this token deals 1 damage to any target.""