Elder Mastery 
Enchantment — Aura
$0.15 #24723 1.00 17.6 years
Enchant creature
Enchanted creature gets +3/+3 and has flying.
Whenever enchanted creature deals damage to a player, that player discards two cards.
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Cards similar to Elder Mastery 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.
Order of Yawgmoth89%
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"Whenever this card deals damage to an opponent, that opponent discards a card."
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$34.72↑#263450.89↓27.3 years↑
"Whenever this creature deals damage to an opponent, that player discards a card."
Larceny86%
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"Whenever a creature you control deals combat damage to a player, that player discards a card."
Specter's Shroud86%
$0.30↑#210530.32↓22.6 years↑
"Whenever equipped creature deals combat damage to a player, that player discards a card."
Blazing Specter85%
$0.66↑#207410.25↓25.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Pain Magnification85%
$1.04↑#12930↑0.88↓20.3 years↑
"Whenever an opponent is dealt 3 or more damage by a single source, that player discards a card."
Nicol Bolas84%
$1.38↑#12349↑0.62↓32.3 years↑
"Whenever this card deals damage to an opponent, that player discards their hand."
Odylic Wraith84%
$0.31↑#246770.44↓29.2 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Hypnotic Specter82%
$1.83↑#8733↑0.05↓33.1 years↑
"Whenever this creature deals damage to an opponent, that player discards a card at random."
Drake Umbra82%
$0.21↑#14854↑0.09↓16.4 years↓
"Enchanted creature gets +3/+3 and has flying."
Chilling Apparition81%
$0.30↑#265660.14↓26.3 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Future Flight80%
$0.63↑#18051↑0.20↓0.9 years↓
"Enchanted creature gets +2/+0 and has flying."
Liliana's Reaver80%
$0.42↑#10295↑0.33↓13.1 years↓
"Whenever this creature deals combat damage to a player, that player discards a card and you create a tapped 2/2 black Zombie creature token."
Griffin Guide80%
$0.07↓#16484↑0.00↓19.9 years↑
"Enchanted creature gets +2/+2 and has flying."
Headhunter80%
$0.32↑#262890.88↓23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Silent Specter80%
$0.53↑#230440.80↓23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Herald of Torment79%
$0.29↑#19416↑0.11↓12.6 years↓
"Enchanted creature gets +3/+3 and has flying."
Cartouche of Knowledge78%
$0.21↑#9693↑0.60↓9.4 years↓
"Enchanted creature gets +1/+1 and has flying."