Most played cards in Mono Red:

1 Decks
City in a Bottle
4 copies - 4 average
Chain Lightning
4 copies - 4 average
Copper Tablet
4 copies - 4 average
Winter Orb
4 copies - 4 average
Red Elemental Blast
4 copies - 4 average
Black Vise
4 copies - 4 average
Mishra's Factory
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Orcish Mechanics
4 copies - 4 average
Ankh of Mishra
4 copies - 4 average
Atog
4 copies - 4 average
Detonate
3 copies - 3 average
Blood Moon
3 copies - 3 average
The Tabernacle at Pendrell Vale
2 copies - 2 average
Wheel of Fortune
1 copies - 1 average
Strip Mine
1 copies - 1 average
Sol Ring
1 copies - 1 average
Mishra's Workshop
1 copies - 1 average
Mox Pearl
1 copies - 1 average
Mana Vault
1 copies - 1 average