Unstoppable Slasher 
Creature — Zombie Assassin
$3.88 #1559 0.88 1.9 years
Deathtouch
Whenever this creature deals combat damage to a player, they lose half their life, rounded up.
When this creature dies, if it had no counters on it, return it to the battlefield tapped under its owner's control with two stun counters on it.
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Cards similar to Unstoppable Slasher 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.
Radioactive Man96%
$0.30↓#22272↓0.00↓0.2 years↓
"Whenever this card deals combat damage to a player, that player loses half their life, rounded up."
+1 more matching line
Raving Dead92%
$1.11↓#16374↓0.9111.8 years↑
"Whenever this creature deals combat damage to a player, that player loses half their life, rounded down."
+1 more matching line
Shredder, Shadow Master90%
$1.60↓#5885↓0.00↓0.5 years↓
"Whenever this card deals combat damage to a player, that player loses half their life, rounded up."
Ebonblade Reaper90%
$5.58↑#9822↓0.22↓23.9 years↑
"Whenever this creature deals combat damage to a player, that player loses half their life, rounded up."
Quietus Spike90%
$1.51↓#2741↓0.60↓17.9 years↑
"Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up."
+1 more matching line
Virtus the Veiled84%
$9.10↑#7736↓0.50↓8.2 years↑
"Whenever Virtus deals combat damage to a player, that player loses half their life, rounded up."
+1 more matching line
Tenacious Dead84%
$0.14↓#13307↓0.29↓13.1 years↑
"When this creature dies, you may pay 
. If you do, return it to the battlefield tapped under its owner's control."
. If you do, return it to the battlefield tapped under its owner's control."
Grievous Wound84%
$0.61↓#3269↓1.11↑1.9 years
"Whenever enchanted player is dealt damage, they lose half their life, rounded up."
Scytheclaw83%
$0.23↓#7293↓0.44↓10.8 years↑
"Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up."
Phytotitan80%
$0.71↓#9018↓0.00↓12.1 years↑
"When this creature dies, return it to the battlefield tapped under its owner's control at the beginning of their next upkeep."
Guildsworn Prowler78%
$0.23↓#10903↓0.00↓4.2 years↑
"Deathtouch"
Dark Leo & Shredder77%
$4.07↑#8636↓0.00↓0.5 years↓
"Whenever this card deal combat damage to a player, create a 1/1 black Ninja creature token. Then if you control five or more Ninjas, that player loses half their life, rounded up."
Jewel-Eyed Cobra77%
$0.20↓#14449↓0.60↓5.2 years↑
"Deathtouch"
Hellcat, Undying Vigilante76%
$0.15↓#23299↓0.00↓0.2 years↓
"When this card dies, return her to the battlefield under her owner's control with a +1/+1 counter on her. She loses all abilities and gains haste."
Retched Wretch76%
$0.15↓#21540↓0.00↓0.6 years↓
"When this creature dies, if it had a -1/-1 counter on it, return it to the battlefield under its owner's control and it loses all abilities."
Wave of Rats76%
$3.19↓#9675↓0.20↓4.4 years↑
"When this creature dies, if it dealt combat damage to a player this turn, return it to the battlefield under its owner's control."
Infernal Vessel76%
$0.17↓#14909↓0.16↓1.8 years
"When this creature dies, if it wasn't a Demon, return it to the battlefield under its owner's control with two +1/+1 counters on it. It's a Demon in addition to its other types."
Harvest Hand // Scrounged Scythe76%
$0.17↓#17851↓0.06↓10.4 years↑
"When this creature dies, return it to the battlefield transformed under your control."
Bogardan Phoenix76%
$1.34↓#27226↓0.39↓29.6 years↑
"When this creature dies, exile it if it had a death counter on it. Otherwise, return it to the battlefield under your control and put a death counter on it."
Optimus Prime, Hero // Optimus Prime, Autobot Leader75%
$13.48↑#9389↓0.50↓3.8 years↑
"When this card dies, return it to the battlefield converted under its owner's control."