Most played cards in Quick and Toast:

3 Decks
Reflecting Pool
12 copies - 4 average
Rune Snag
12 copies - 4 average
Vivid Creek
12 copies - 4 average
Wall of Roots
12 copies - 4 average
Cryptic Command
11 copies - 3.67 average
Vivid Grove
11 copies - 3.67 average
Condemn
8 copies - 2.67 average
Mulldrifter
8 copies - 2.67 average
Cloudthresher
8 copies - 2.67 average
Grove of the Burnwillows
7 copies - 2.33 average
Firespout
7 copies - 2.33 average
Mystical Teachings
7 copies - 2.33 average
Kitchen Finks
6 copies - 2 average
Makeshift Mannequin
5 copies - 1.67 average
Flooded Grove
5 copies - 1.67 average
Careful Consideration
5 copies - 1.67 average
Extirpate
5 copies - 1.67 average
Teferi, Mage of Zhalfir
4 copies - 1.33 average
Damnation
4 copies - 1.33 average
Crovax, Ascendant Hero
4 copies - 1.33 average