Most played cards in Four-Color Emerge:

3 Decks
Kozilek's Return
12 copies - 4 average
Grapple with the Past
12 copies - 4 average
Gather the Pack
11 copies - 3.67 average
Elder Deep-Fiend
11 copies - 3.67 average
Traverse the Ulvenwald
10 copies - 3.33 average
Yavimaya Coast
10 copies - 3.33 average
Jace, Vryn's Prodigy
8 copies - 2.67 average
Evolving Wilds
8 copies - 2.67 average
Haunted Dead
8 copies - 2.67 average
Prized Amalgam
8 copies - 2.67 average
Llanowar Wastes
7 copies - 2.33 average
Gnarlwood Dryad
6 copies - 2 average
Ishkanah, Grafwidow
6 copies - 2 average
Vessel of Nascency
6 copies - 2 average
Noose Constrictor
4 copies - 1.33 average
Nissa, Vastwood Seer
4 copies - 1.33 average
Transgress the Mind
4 copies - 1.33 average
Languish
4 copies - 1.33 average
Sunken Hollow
4 copies - 1.33 average
Nissa's Pilgrimage
4 copies - 1.33 average