Most played cards in Elves:

2 Decks
Naturalize
8 copies - 4 average
Elvish Warrior
8 copies - 4 average
Elvish Champion
8 copies - 4 average
Llanowar Elves
8 copies - 4 average
Might of Oaks
6 copies - 3 average
Wood Elves
4 copies - 2 average
Watchwolf
4 copies - 2 average
Selesnya Guildmage
4 copies - 2 average
Norwood Ranger
4 copies - 2 average
Elvish Berserker
4 copies - 2 average
Brushland
4 copies - 2 average
Umezawa's Jitte
4 copies - 2 average
Persecute
4 copies - 2 average
Putrefy
4 copies - 2 average
Gather Courage
4 copies - 2 average
Elves of Deep Shadow
4 copies - 2 average
Llanowar Wastes
4 copies - 2 average
Overgrown Tomb
4 copies - 2 average
Giant Growth
4 copies - 2 average
Circle of Protection: Black
4 copies - 2 average