Mage Slayer 
Artifact — Equipment
$1.65 #4355 0.25 17.3 years
Whenever equipped creature attacks, it deals damage equal to its power to the player or planeswalker it's attacking.
Equip 
Click a line or tag to filter
Cards similar to Mage 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.
Hellrider89%
$0.53↓#5832↓0.1614.6 years↓
"Whenever a creature you control attacks, this creature deals 1 damage to the player or planeswalker it's attacking."
Cavalcade of Calamity87%
$0.26↓#9636↓0.76↑7.6 years↓
"Whenever a creature you control with power 1 or less attacks, this enchantment deals 1 damage to the player or planeswalker that creature is attacking."
Stalking Vengeance82%
$0.26↓#5259↓0.2421.0 years↑
"Whenever another creature you control dies, it deals damage equal to its power to target player or planeswalker."
Raid Bombardment82%
$0.22↓#3468↑0.3316.4 years
"Whenever a creature you control with power 2 or less attacks, this enchantment deals 1 damage to the player or planeswalker that creature is attacking."
Surestrike Trident82%
$1.50↓#14041↓0.08↓22.6 years↑
"Equipped creature has first strike and "
, Unattach this card: This creature deals damage equal to its power to target player or planeswalker.""
, Unattach this card: This creature deals damage equal to its power to target player or planeswalker.""+1 more matching line
Fiendlash82%
$0.39↓#49780.335.1 years↓
"Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker."
Sorcerer's Wand80%
$0.13↓#16078↓0.338.4 years↓
"Equip "
"
Lion Heart80%
$0.19↓#13651↓0.09↓1.2 years↓
"Equip 
"
"
Stormbeacon Blade80%
$0.23↓#12389↓0.11↓1.4 years↓
"Equip "
"
Iconic Shield80%
$0.32↓#25050↓0.00↓0.2 years↓
"Equip "
"
Viridian Longbow78%
$0.67↓#46020.2922.9 years↑
"Equip "
"
Infantry Shield78%
$0.86↓#3293↑0.201.4 years↓
"Equip "
"
Inquisitorial Rosette78%
$2.78↑#6900↓0.55↑3.9 years↓
"Equip "
"
Andúril, Narsil Reforged78%
$15.41↑#2604↑0.41↑2.8 years↓
"Equip "
"
White Mage's Staff77%
$0.11↓#8063↓0.231.2 years↓
"Equip "
"
Livewire Lash77%
$0.19↓#12756↓0.00↓15.9 years↓
"Equip "
"
Razor Boomerang77%
$0.23↓#27750↓0.1916.6 years
"Equip "
"
Web-Shooters77%
$0.24↓#11598↓0.40↑1.0 years↓
"Equip "
"
Scorch Spitter76%
$0.20↓#13532↓0.00↓7.2 years↓
"Whenever this creature attacks, it deals 1 damage to the player or planeswalker it's attacking."
Charge of the Forever-Beast76%
$0.12↓#25561↓0.296.4 years↓
"this card deals damage to target creature or planeswalker equal to the revealed card's power."