Divide by Zero 
Instant
$0.10 #17156 0.59 5.5 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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Guiding Voice86%
$0.17↑#24005↓0.00↓5.5 years
"Learn."
Cram Session86%
$0.13↑#25431↓0.25↓5.5 years
"Learn."
Igneous Inspiration86%
$0.09↓#25802↓0.00↓5.5 years
"Learn."
Sink into Stupor // Soporific Springs86%
$9.29↑#166↑0.32↓2.3 years↓
"Return target spell or nonland permanent an opponent controls to its owner's hand."
Pop Quiz86%
$0.15↑#25138↓0.12↓5.5 years
"Learn."
Venser, Shaper Savant85%
$0.45↑#1986↑0.29↓19.5 years↑
"When this card enters, return target spell or permanent to its owner's hand."
Study Break85%
$0.14↑#25252↓0.06↓5.5 years
"Learn."
Enthusiastic Study85%
$0.24↑#203920.07↓5.5 years
"Learn."
Hunt for Specimens84%
$0.17↑#183950.05↓5.5 years
"Learn."
Arcane Subtraction84%
$0.07↓#25630↓0.33↓5.5 years
"Learn."
Hullbreaker Horror84%
$5.95↑#278↑2.00↑4.9 years
"• Return target spell you don't control to its owner's hand."
Unsubstantiate83%
$0.19↑#5127↑0.44↓10.2 years↑
"Return target spell or creature to its owner's hand."
First Day of Class82%
$0.21↑#9878↑0.33↓5.5 years
"Learn."
Academic Dispute82%
$0.27↑#180290.12↓5.5 years
"Learn."
Reprieve82%
$1.53↑#594↑0.48↓3.3 years↓
"Return target spell to its owner's hand."
+1 more matching line
Rise of Extus81%
$0.09↓#29255↓0.00↓5.5 years
"Learn."
Field Trip79%
$0.15↑#186120.00↓5.5 years
"Learn."
Failure // Comply78%
$0.30↑#21879↓0.27↓9.5 years↑
"Return target spell to its owner's hand."
+1 more matching line
Spellscorn Coven // Take It Back78%
$0.21↑#11589↑0.43↓3.1 years↓
"Return target spell to its owner's hand."
Eye of Nowhere76%
$0.23↑#191410.11↓22.1 years↑
"Return target permanent to its owner's hand."