Divide by Zero 
Instant
$0.08 #16956 0.07 5.4 years
Return target spell or permanent with mana value 1 or greater to its owner's hand.
Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)
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Cram Session86%
$0.14↑#25196↓0.31↑5.4 years
"Learn."
Guiding Voice86%
$0.14↑#23779↓0.115.4 years
"Learn."
Igneous Inspiration86%
$0.08#25516↓0.075.4 years
"Learn."
Sink into Stupor // Soporific Springs86%
$7.79↑#171↑0.52↑2.2 years↓
"Return target spell or nonland permanent an opponent controls to its owner's hand."
Venser, Shaper Savant85%
$0.33↑#1966↑0.40↑19.3 years↑
"When this card enters, return target spell or permanent to its owner's hand."
Pop Quiz85%
$0.15↑#24894↓0.005.4 years
"Learn."
Enthusiastic Study84%
$0.23↑#201250.50↑5.4 years
"Learn."
Hunt for Specimens84%
$0.18↑#182190.42↑5.4 years
"Learn."
Study Break84%
$0.10↑#24906↓0.005.4 years
"Learn."
Arcane Subtraction84%
$0.07↓#25556↓0.20↑5.4 years
"Learn."
Hullbreaker Horror84%
$5.32↑#274↑1.74↑4.8 years
"• Return target spell you don't control to its owner's hand."
Unsubstantiate83%
$0.19↑#5121↑0.39↑10.1 years↑
"Return target spell or creature to its owner's hand."
First Day of Class82%
$0.19↑#10155↑0.52↑5.4 years
"Learn."
Reprieve82%
$1.78↑#608↑0.35↑3.2 years↓
"Return target spell to its owner's hand."
+1 more matching line
Academic Dispute82%
$0.23↑#177650.22↑5.4 years
"Learn."
Rise of Extus81%
$0.10↑#28839↓0.005.4 years
"Learn."
Field Trip79%
$0.16↑#183600.29↑5.4 years
"Learn."
Failure // Comply78%
$0.31↑#21684↓0.35↑9.4 years↑
"Return target spell to its owner's hand."
+1 more matching line
Spellscorn Coven // Take It Back78%
$0.26↑#11222↑0.38↑3.0 years↓
"Return target spell to its owner's hand."
Boomerang76%
$0.12↑#9687↑0.22↑32.3 years↑
"Return target permanent to its owner's hand."