Most played cards in Rakdos:

8 Decks
Dragonskull Summit
20 copies - 2.5 average
Lightning Strike
19 copies - 2.38 average
Scrapheap Scrounger
16 copies - 2 average
Fatal Push
15 copies - 1.88 average
Hazoret the Fervent
14 copies - 1.75 average
Canyon Slough
13 copies - 1.63 average
Dread Wanderer
12 copies - 1.5 average
Night Market Lookout
12 copies - 1.5 average
Aether Hub
12 copies - 1.5 average
Duress
12 copies - 1.5 average
Glint-Sleeve Siphoner
12 copies - 1.5 average
Gifted Aetherborn
11 copies - 1.38 average
Unlicensed Disintegration
10 copies - 1.25 average
Yahenni, Undying Partisan
10 copies - 1.25 average
Aethersphere Harvester
10 copies - 1.25 average
Bontu's Last Reckoning
9 copies - 1.13 average
Vicious Conquistador
8 copies - 1 average
Bomat Courier
8 copies - 1 average
Abrade
7 copies - 0.88 average
Earthshaker Khenra
6 copies - 0.75 average