Most played cards in Copy Artifact Combo:

1 Decks
Disenchant
4 copies - 4 average
Tundra
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Copy Artifact
4 copies - 4 average
Counterspell
4 copies - 4 average
City of Brass
3 copies - 3 average
Underground Sea
3 copies - 3 average
Mishra's Factory
3 copies - 3 average
Blue Elemental Blast
3 copies - 3 average
Red Elemental Blast
3 copies - 3 average
Millstone
3 copies - 3 average
Fellwar Stone
2 copies - 2 average
Volcanic Island
2 copies - 2 average
Circle of Protection: Red
2 copies - 2 average
Jayemdae Tome
2 copies - 2 average
Dust to Dust
2 copies - 2 average
The Abyss
2 copies - 2 average
Circle of Protection: Black
2 copies - 2 average
Wrath of God
1 copies - 1 average
Sol Ring
1 copies - 1 average