Most played cards in Temur Cascade:

5 Decks
Shardless Agent
20 copies - 4 average
Force of Will
20 copies - 4 average
Violent Outburst
20 copies - 4 average
Misty Rainforest
20 copies - 4 average
Elvish Spirit Guide
20 copies - 4 average
Wooded Foothills
19 copies - 3.8 average
Lórien Revealed
19 copies - 3.8 average
Fire // Ice
19 copies - 3.8 average
Simian Spirit Guide
18 copies - 3.6 average
Endurance
17 copies - 3.4 average
Force of Negation
17 copies - 3.4 average
Force of Vigor
16 copies - 3.2 average
Crashing Footfalls
16 copies - 3.2 average
Wasteland
15 copies - 3 average
Mystical Dispute
15 copies - 3 average
Brazen Borrower
14 copies - 2.8 average
Blood Moon
11 copies - 2.2 average
Minsc & Boo, Timeless Heroes
11 copies - 2.2 average
Tropical Island
9 copies - 1.8 average
Volcanic Island
8 copies - 1.6 average