Ebonblade Reaper 

Creature — Human Cleric
Whenever this creature attacks, you lose half your life, rounded up.
Whenever this creature deals combat damage to a player, that player loses half their life, rounded up.
Morph {3}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
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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.
Raving Dead 100%
$1.21#16150
"Whenever this creature deals combat damage to a player, that player loses half their life, rounded down."
Unstoppable Slasher 91%
$4.89#1615
"Whenever this creature deals combat damage to a player, they lose half their life, rounded up."
Scytheclaw 87%
$0.26#7251
"Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up."
Quietus Spike 87%
$1.75#2690
"Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up."
Radioactive Man 87%
$0.76#24925
"Whenever this card deals combat damage to a player, that player loses half their life, rounded up."
Shredder, Shadow Master 87%
$0.94#6431
"Whenever this card deals combat damage to a player, that player loses half their life, rounded up."
Headless Specter 86%
$0.08#27598
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards a card at random."
Dreamstealer 86%
$0.28#16148
"Whenever this creature deals combat damage to a player, that player discards that many cards."
+1 more matching line
Needle Specter 86%
$1.15#17350
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Blinding Angel 86%
$5.10#12495
"Whenever this creature deals combat damage to a player, that player skips their next combat phase."
Book Devourer 85%
$0.19#23187
"Whenever this creature deals combat damage to a player, you may discard all the cards in your hand. If you do, draw that many cards."
Scourge of the Skyclaves 85%
$0.53#11439
"When you cast this spell, if it was kicked, each player loses half their life, rounded up."
Jagged Poppet 84%
$0.31#21845
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards cards equal to the damage."