Most played cards in Idiot Life:

2 Decks
Condemn
8 copies - 4 average
Martyr of Sands
8 copies - 4 average
Weathered Wayfarer
8 copies - 4 average
Wrath of God
8 copies - 4 average
Proclamation of Rebirth
7 copies - 3.5 average
Circle of Protection: Red
6 copies - 3 average
Urza's Tower
5 copies - 2.5 average
Urza's Power Plant
5 copies - 2.5 average
Urza's Mine
5 copies - 2.5 average
Adarkar Wastes
4 copies - 2 average
Muse Vessel
4 copies - 2 average
Castigate
4 copies - 2 average
Azorius Signet
4 copies - 2 average
Compulsive Research
4 copies - 2 average
Annex
4 copies - 2 average
Remand
4 copies - 2 average
Hallowed Fountain
4 copies - 2 average
Chronosavant
4 copies - 2 average
Caves of Koilos
4 copies - 2 average
Orzhov Basilica
4 copies - 2 average