Most played cards in Goblins:

5 Decks
Goblin Lackey
19 copies - 3.8 average
Cavern of Souls
18 copies - 3.6 average
Goblin Matron
12 copies - 2.4 average
Goblin Ringleader
12 copies - 2.4 average
Goblin Warchief
12 copies - 2.4 average
Wasteland
12 copies - 2.4 average
Aether Vial
12 copies - 2.4 average
Goblin Chieftain
12 copies - 2.4 average
Bloodstained Mire
11 copies - 2.2 average
Krenko, Mob Boss
10 copies - 2 average
Goblin Piledriver
9 copies - 1.8 average
Thalia, Guardian of Thraben
9 copies - 1.8 average
Null Rod
8 copies - 1.6 average
Mental Misstep
8 copies - 1.6 average
Grafdigger's Cage
8 copies - 1.6 average
Force of Will
8 copies - 1.6 average
Leyline of Sanctity
8 copies - 1.6 average
Scalding Tarn
8 copies - 1.6 average
Volcanic Island
8 copies - 1.6 average
Lightning Bolt
7 copies - 1.4 average