Shredder, Shadow Master 
Legendary Creature — Human Ninja
$1.60 #5885 0.00 0.5 years
Whenever Shredder attacks a player, for each other opponent, create a token that's a copy of Shredder tapped and attacking that player, except it isn't legendary. Sacrifice those tokens at end of combat.
Whenever Shredder deals combat damage to a player, that player loses half their life, rounded up.
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Cards similar to Shredder, Shadow Master 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↓0.000.2 years
"Whenever this card deals combat damage to a player, that player loses half their life, rounded up."
Raving Dead92%
$1.11↓#16374↓0.91↑11.8 years↑
"Whenever this creature deals combat damage to a player, that player loses half their life, rounded down."
+1 more matching line
Ebonblade Reaper91%
$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."
Unstoppable Slasher90%
$3.88↑#1559↑0.88↑1.9 years↑
"Whenever this creature deals combat damage to a player, they lose half their life, rounded up."
Quietus Spike89%
$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."
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."
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."
Grievous Wound82%
$0.61↓#3269↑1.11↑1.9 years↑
"Whenever enchanted player is dealt damage, they lose half their life, rounded up."
Living Laser79%
$0.29↓#13077↓0.000.2 years
"Whenever this card attacks, for each card you've discarded this turn, create a token that's a copy of this card, except the token isn't legendary. The tokens enter tapped and attacking. Exile the tokens at the beginning of the next end step."
Dark Leo & Shredder76%
$4.07↑#8636↓0.000.5 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."
Sun-Blessed Guardian // Furnace-Blessed Conqueror76%
$0.12↓#27239↓0.40↑3.4 years↑
"Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Put a +1/+1 counter on that token for each +1/+1 counter on this creature. Sacrifice that token at the beginning of the next end step."
Calamity, Galloping Inferno74%
$0.31↓#64240.48↑2.4 years↑
"Whenever this card attacks while saddled, choose a nonlegendary creature that saddled it this turn and create a tapped and attacking token that's a copy of it. Sacrifice that token at the beginning of the next end step. Repeat this process once."
Loki, the Deceiver74%
$0.33↓#11335↓0.000.2 years
"Whenever this card attacks, create a tapped and attacking token that's a copy of another target Villain you control, except it isn't legendary and it's an Illusion in addition to its other types. Sacrifice that token at the beginning of the next end step."
Mardu Siegebreaker74%
$0.38↓#3781↑0.29↑1.4 years
"Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens."
Phantom Steed74%
$0.42↓#11350↓0.27↑5.1 years↑
"Whenever this creature attacks, create a tapped and attacking token that's a copy of the exiled card, except it's an Illusion in addition to its other types. Sacrifice that token at end of combat."
Aphelia, Viper Whisperer72%
$19.08↑#9646↓0.54↑1.8 years↑
"
: Until end of turn, whenever one or more Gorgons and/or Snakes you control deal combat damage to a player, that player loses half their life, rounded up."
: Until end of turn, whenever one or more Gorgons and/or Snakes you control deal combat damage to a player, that player loses half their life, rounded up."+1 more matching line
Kari Zev, Skyship Raider72%
$0.22↓#58150.13↑9.6 years↑
"Whenever this card attacks, create Ragavan, a legendary 2/1 red Monkey creature token. Ragavan enters tapped and attacking. Exile that token at end of combat."
Fathom Fleet Swordjack72%
$0.24↓#8685↓0.33↑5.8 years↑
"Encore 
, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery."
, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery."
Kinsbaile Courier71%
$0.16↓#23439↓0.28↑5.8 years↑
"Encore 
, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery."
, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery."
Spellbinding Soprano71%
$0.27↓#19160↓0.19↑4.4 years↑
"Encore , Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery."
, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery."