Most played cards in 5 Color Cascade:

2 Decks
Blightning
8 copies - 4 average
Bloodbraid Elf
8 copies - 4 average
Exotic Orchard
8 copies - 4 average
Captured Sunlight
7 copies - 3.5 average
Maelstrom Pulse
7 copies - 3.5 average
Savage Lands
7 copies - 3.5 average
Crumbling Necropolis
6 copies - 3 average
Bituminous Blast
6 copies - 3 average
Ajani Vengeant
5 copies - 2.5 average
Jungle Shrine
5 copies - 2.5 average
Enlisted Wurm
5 copies - 2.5 average
Jund Charm
5 copies - 2.5 average
Anathemancer
4 copies - 2 average
Naya Charm
4 copies - 2 average
Esper Charm
4 copies - 2 average
Uril, the Miststalker
4 copies - 2 average
Celestial Purge
4 copies - 2 average
Sprouting Thrinax
4 copies - 2 average
Rupture Spire
4 copies - 2 average
Wall of Denial
4 copies - 2 average