Most played cards in Gruul:

4 Decks
Rootbound Crag
16 copies - 4 average
Lava Coil
13 copies - 3.25 average
Llanowar Elves
12 copies - 3 average
Wayward Swordtooth
12 copies - 3 average
Regisaur Alpha
12 copies - 3 average
Experimental Frenzy
11 copies - 2.75 average
Banefire
11 copies - 2.75 average
Treasure Map
10 copies - 2.5 average
Commune with Dinosaurs
10 copies - 2.5 average
Carnage Tyrant
10 copies - 2.5 average
Thrashing Brontodon
9 copies - 2.25 average
Deathgorge Scavenger
8 copies - 2 average
Thunderherd Migration
8 copies - 2 average
Fight with Fire
8 copies - 2 average
Ripjaw Raptor
7 copies - 1.75 average
Vivien Reid
7 copies - 1.75 average
Fiery Cannonade
6 copies - 1.5 average
Merfolk Branchwalker
6 copies - 1.5 average
Jadelight Ranger
6 copies - 1.5 average
Adventurous Impulse
4 copies - 1 average