Most played cards in Teachings:

3 Decks
Mana Leak
12 copies - 4 average
Cryptic Command
12 copies - 4 average
Mystical Teachings
8 copies - 2.67 average
Crumbling Necropolis
8 copies - 2.67 average
Relic of Progenitus
8 copies - 2.67 average
Creeping Tar Pit
7 copies - 2.33 average
Sunken Ruins
7 copies - 2.33 average
Negate
7 copies - 2.33 average
Reflecting Pool
6 copies - 2 average
Volcanic Fallout
6 copies - 2 average
Thoughtseize
6 copies - 2 average
Lightning Bolt
6 copies - 2 average
Punishing Fire
6 copies - 2 average
Scalding Tarn
6 copies - 2 average
Grove of the Burnwillows
6 copies - 2 average
Cruel Ultimatum
6 copies - 2 average
Cascade Bluffs
6 copies - 2 average
Jace, the Mind Sculptor
6 copies - 2 average
Damnation
6 copies - 2 average
Dreadship Reef
6 copies - 2 average