Most played cards in Mono Red Painters:

2 Decks
Painter's Servant
8 copies - 4 average
Goblin Welder
8 copies - 4 average
Ancient Tomb
8 copies - 4 average
Pyroblast
8 copies - 4 average
Magus of the Moon
8 copies - 4 average
Goblin Engineer
8 copies - 4 average
Leyline of the Void
8 copies - 4 average
Fable of the Mirror-Breaker
8 copies - 4 average
Fury
8 copies - 4 average
Urza's Saga
8 copies - 4 average
Lightning Bolt
7 copies - 3.5 average
Great Furnace
6 copies - 3 average
Mindbreak Trap
6 copies - 3 average
Lotus Petal
5 copies - 2.5 average
Simian Spirit Guide
5 copies - 2.5 average
Red Elemental Blast
4 copies - 2 average
City of Traitors
4 copies - 2 average
Grindstone
4 copies - 2 average
Fiery Confluence
2 copies - 1 average
Pithing Needle
2 copies - 1 average