Most played cards in Elemenetals:

4 Decks
Solitude
16 copies - 4 average
Windswept Heath
16 copies - 4 average
Risen Reef
16 copies - 4 average
Ephemerate
16 copies - 4 average
Omnath, Locus of Creation
16 copies - 4 average
Fury
16 copies - 4 average
Teferi, Time Raveler
15 copies - 3.75 average
Force of Negation
14 copies - 3.5 average
Misty Rainforest
13 copies - 3.25 average
Prismatic Ending
13 copies - 3.25 average
Cavern of Souls
13 copies - 3.25 average
Utopia Sprawl
12 copies - 3 average
Mulldrifter
11 copies - 2.75 average
Endurance
10 copies - 2.5 average
Alpine Moon
9 copies - 2.25 average
Flooded Strand
9 copies - 2.25 average
Flamekin Harbinger
8 copies - 2 average
Rest in Peace
8 copies - 2 average
Lightning Bolt
7 copies - 1.75 average
Temple Garden
6 copies - 1.5 average