Rem Karolus, Stalwart Slayer 
Legendary Creature — Human Knight
$0.36 #7919 0.22 4.9 years
Flying, haste
If a spell would deal damage to you or another permanent you control, prevent that damage.
If a spell would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 1 instead.
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Cards similar to Rem Karolus, Stalwart Slayer 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.
Gisela, Blade of Goldnight90%
$4.91↑#1133↑0.75↑14.4 years↑
"If a source would deal damage to an opponent or a permanent an opponent controls, that source deals double that damage to that player or permanent instead."
+1 more matching line
Endure86%
$0.18↓#27090↓0.33↑18.1 years↑
"Prevent all damage that would be dealt to you and permanents you control this turn."
Thor, Asgard's Avenger85%
$0.35↓#14493↓0.00↓0.2 years↓
"If another source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 1 instead."
Palisade Giant82%
$0.27↓#16404↓0.40↑13.9 years↑
"All damage that would be dealt to you and other permanents you control is dealt to this creature instead."
Hawkeye, Young Avenger82%
$0.31↓#11129↓0.00↓0.2 years↓
"If a source you control would deal noncombat damage to an opponent or a permanent an opponent controls, instead it deals that much damage plus X, where X is this card's power."
Sulfuric Vapors82%
$0.43↑#26548↓0.43↑27.9 years↑
"If a red spell would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead."
Harm's Way81%
$0.08↓#28209↓0.2717.1 years↑
"The next 2 damage that a source of your choice would deal to you and/or permanents you control this turn is dealt to any target instead."
Spiked Corridor // Torture Pit80%
$5.99↑#4167↑0.251.9 years↓
"If a source you control would deal noncombat damage to an opponent, it deals that much damage plus 2 instead."
Taii Wakeen, Perfect Shot80%
$0.26↓#85910.44↑2.4 years↓
"
, 
: If a source you control would deal noncombat damage to a permanent or player this turn, it deals that much damage plus X instead."
, : If a source you control would deal noncombat damage to a permanent or player this turn, it deals that much damage plus X instead."
Equal Treatment80%
$0.30↓#23277↓0.2724.6 years↑
"If any source would deal 1 or more damage to a permanent or player this turn, it deals 2 damage to that permanent or player instead."
Artist's Talent80%
$5.82↑#1554↑0.242.1 years↓
"If a source you control would deal noncombat damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead."
Pyromancer's Swath80%
$0.72↑#13751↓0.00↓19.3 years↑
"If an instant or sorcery source you control would deal damage to a permanent or player, it deals that much damage plus 2 to that permanent or player instead."
Reidane, God of the Worthy // Valkmira, Protector's Shield78%
$0.44↑#63650.71↑5.6 years
"If a source an opponent controls would deal damage to you or a permanent you control, prevent 1 of that damage."
Hedron-Field Purists78%
$0.36#22327↓0.3116.4 years↑
"If a source would deal damage to you or a creature you control, prevent 1 of that damage."
Gideon's Intervention78%
$0.27↓#20742↓0.56↑9.4 years↑
"Prevent all damage that would be dealt to you and permanents you control by sources with the chosen name."
Divine Deflection78%
$0.26↓#19938↓0.06↓14.3 years↑
"Prevent the next X damage that would be dealt to you and/or permanents you control this turn. If damage is prevented this way, this card deals that much damage to any target."
Tor Wauki the Younger78%
$0.35↓#6214↑0.304.0 years
"If another source you control would deal noncombat damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead."
Personal Sanctuary78%
$0.29↓#22903↓0.57↑15.1 years↑
"During your turn, prevent all damage that would be dealt to you."
The Wanderer78%
$0.32↓#4993↑0.35↑7.3 years↑
"Prevent all noncombat damage that would be dealt to you and other permanents you control."
Cover of Winter77%
$0.45↑#21065↓0.2820.1 years↑
"If a creature would deal combat damage to you and/or one or more creatures you control, prevent X of that damage, where X is the number of age counters on this enchantment."