Curse of Obsession 
Enchantment — Aura Curse
$0.35 #10224 0.54 4.9 years
Enchant player
At the beginning of enchanted player's draw step, that player draws two additional cards.
At the beginning of enchanted player's end step, that player discards their hand.
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Cards similar to Curse of Obsession 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.
Grafted Skullcap88%
$3.93↑#16469↓0.37↓27.9 years↑
"At the beginning of your draw step, draw an additional card."
+1 more matching line
Avaricious Dragon88%
$2.46↑#110750.4811.1 years↑
"At the beginning of your draw step, draw an additional card."
+1 more matching line
Song of Creation83%
$0.92↑#4852↑0.41↓6.4 years↑
"At the beginning of your end step, discard your hand."
Tenuous Truce80%
$0.36↑#3254↑0.16↓4.4 years
"At the beginning of enchanted opponent's end step, you and that player each draw a card."
+1 more matching line
Super Intelligence80%
$0.27↓#106660.00↓0.2 years↓
"At the beginning of the upkeep of enchanted creature's controller, that player draws a card."
+1 more matching line
Righteous Authority78%
$0.33↓#104330.31↓13.9 years↑
"At the beginning of the draw step of enchanted creature's controller, that player draws an additional card."
Psychic Vortex78%
$3.78↑#15100↓0.5629.2 years↑
"Cumulative upkeep—Draw a card."
+1 more matching line
Heightened Awareness76%
$0.26↓#26808↓0.15↓26.3 years↑
"At the beginning of your draw step, draw an additional card."
+1 more matching line
Well of Ideas74%
$1.56↑#6713↑0.17↓11.8 years↑
"At the beginning of each other player's draw step, that player draws an additional card."
Font of Mythos74%
$15.31↑#2161↑0.30↓17.6 years↑
"At the beginning of each player's draw step, that player draws two additional cards."
Dictate of Kruphix74%
$0.37↑#1870↑0.28↓12.4 years↑
"At the beginning of each player's draw step, that player draws an additional card."
Kami of the Crescent Moon74%
$7.41↑#1804↑0.17↓21.3 years↑
"At the beginning of each player's draw step, that player draws an additional card."
Sire of Insanity73%
$0.48↑#87961.58↑13.3 years↑
"At the beginning of each end step, each player discards their hand."
Sarkhan, the Dragonspeaker72%
$0.28↓#14675↓0.18↓11.9 years↑
"−6: You get an emblem with "At the beginning of your draw step, draw two additional cards" and "At the beginning of your end step, discard your hand.""
Nekusar, the Mindrazer70%
$3.45↑#3732↑1.24↑12.8 years↑
"At the beginning of each player's draw step, that player draws an additional card."
Rites of Flourishing70%
$0.62↑#1522↑0.34↓19.3 years↑
"At the beginning of each player's draw step, that player draws an additional card."
Four Knocks70%
$0.77↑#88020.67↑2.9 years↓
"At the beginning of your first main phase, draw a card."
Spiteful Visions70%
$0.57↑#2297↑0.5118.3 years↑
"At the beginning of each player's draw step, that player draws an additional card."
Master of the Feast70%
$5.64↑#4557↑0.27↓12.3 years↑
"At the beginning of your upkeep, each opponent draws a card."