Most played cards in Gruul:

4 Decks
Rootbound Crag
16 copies - 4 average
Sheltered Thicket
16 copies - 4 average
Ripjaw Raptor
16 copies - 4 average
Deathgorge Scavenger
15 copies - 3.75 average
Abrade
14 copies - 3.5 average
Carnage Tyrant
13 copies - 3.25 average
Drover of the Mighty
12 copies - 3 average
Commune with Dinosaurs
12 copies - 3 average
Regisaur Alpha
12 copies - 3 average
Savage Stomp
11 copies - 2.75 average
Otepec Huntmaster
10 copies - 2.5 average
Glorybringer
9 copies - 2.25 average
Magma Spray
8 copies - 2 average
Chandra, Torch of Defiance
8 copies - 2 average
Vance's Blasting Cannons
6 copies - 1.5 average
Hashep Oasis
6 copies - 1.5 average
Sweltering Suns
6 copies - 1.5 average
Attune with Aether
4 copies - 1 average
Voltaic Brawler
4 copies - 1 average
Blossoming Defense
4 copies - 1 average