Most played cards in Show and Tell:

3 Decks
Force of Will
12 copies - 4 average
Show and Tell
12 copies - 4 average
Preordain
11 copies - 3.67 average
Emrakul, the Aeons Torn
9 copies - 3 average
Daze
8 copies - 2.67 average
Brainstorm
8 copies - 2.67 average
Ponder
8 copies - 2.67 average
Ancient Tomb
7 copies - 2.33 average
Defense Grid
6 copies - 2 average
Misty Rainforest
6 copies - 2 average
Omniscience
6 copies - 2 average
Lotus Petal
6 copies - 2 average
Impulse
5 copies - 1.67 average
Griselbrand
5 copies - 1.67 average
Veil of Summer
4 copies - 1.33 average
Cunning Wish
4 copies - 1.33 average
Thought Lash
4 copies - 1.33 average
Surgical Extraction
4 copies - 1.33 average
Ice-Fang Coatl
4 copies - 1.33 average
Snow-Covered Island
4 copies - 1.33 average