Curious Obsession 
Enchantment — Aura
$0.22 #8565 0.06 8.6 years
Enchant creature
Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, you may draw a card."
At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice this Aura.
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Cards similar to Curious Obsession expected a card that isn't here?
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Sixth Sense94%
$0.33↑#6168↑0.26↑9.4 years
"Enchanted creature has "Whenever this creature deals combat damage to a player, you may draw a card.""
+1 more matching line
Mischievous Catgeist // Catlike Curiosity88%
$0.26↑#11872↓0.054.8 years↓
"Enchanted creature has "Whenever this creature deals combat damage to a player, draw a card.""
+1 more matching line
Snake Umbra88%
$0.81↑#1497↑0.20↑16.4 years↑
"Enchanted creature gets +1/+1 and has "Whenever this creature deals damage to an opponent, you may draw a card.""
See Red88%
$0.07↓#26865↓0.008.6 years
"At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice this Aura."
Coastal Piracy86%
$0.26↑#1510↑0.20↑26.9 years↑
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Staggering Insight86%
$0.19↓#5492↑0.26↑6.6 years↓
"Enchanted creature gets +1/+1 and has lifelink and "Whenever this creature deals combat damage to a player, draw a card.""
+1 more matching line
Combat Research85%
$0.81↑#2190↑0.16↑4.0 years↓
"Enchanted creature has "Whenever this creature deals combat damage to a player, draw a card.""
Ophidian Eye85%
$12.21↑#1633↑0.56↑19.9 years↑
"Whenever enchanted creature deals damage to an opponent, you may draw a card."
+1 more matching line
Keen Sense85%
$2.19↑#2859↑0.18↑19.6 years↑
"Whenever enchanted creature deals damage to an opponent, you may draw a card."
Rogue's Gloves84%
$0.30↑#4101↑0.1312.1 years↑
"Whenever equipped creature deals combat damage to a player, you may draw a card."
Curious Inquiry84%
$0.24↑#12150↓0.33↑2.6 years↓
"Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, investigate.""
Neurok Commando84%
$0.08↓#18935↓0.1515.6 years↑
"Whenever this creature deals combat damage to a player, you may draw a card."
Stealer of Secrets84%
$0.05↓#20654↓0.24↑13.9 years↑
"Whenever this creature deals combat damage to a player, draw a card."
Scroll Thief84%
$0.06↓#17095↓0.36↑16.1 years↑
"Whenever this creature deals combat damage to a player, draw a card."
Nine-Tail White Fox84%
$0.21↓#22046↓0.31↑8.2 years
"Whenever this creature deals combat damage to a player, draw a card."
Sea-Dasher Octopus84%
$0.80↑#4721↑0.18↑6.4 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Ultimecia, Temporal Threat83%
$0.43↑#75470.57↑1.2 years↓
"Whenever a creature you control deals combat damage to a player, draw a card."
Sleeper's Robe82%
$0.59↑#15516↓0.29↑25.9 years↑
"Whenever enchanted creature deals combat damage to an opponent, you may draw a card."
Reconnaissance Mission82%
$0.31↑#892↑0.156.4 years↓
"Whenever a creature you control deals combat damage to a player, you may draw a card."