Most played cards in Thopter Foundry:

2 Decks
Esper Sentinel
8 copies - 4 average
Portable Hole
8 copies - 4 average
Ingenious Smith
8 copies - 4 average
Stoneforge Mystic
8 copies - 4 average
Urza's Saga
8 copies - 4 average
Flooded Strand
7 copies - 3.5 average
Urza, Lord High Artificer
6 copies - 3 average
Metallic Rebuke
6 copies - 3 average
Dispatch
5 copies - 2.5 average
Razortide Bridge
5 copies - 2.5 average
Thopter Foundry
5 copies - 2.5 average
Seachrome Coast
4 copies - 2 average
Mystical Dispute
4 copies - 2 average
Ragavan, Nimble Pilferer
4 copies - 2 average
Teferi, Time Raveler
4 copies - 2 average
Hallowed Fountain
4 copies - 2 average
Prismatic Ending
4 copies - 2 average
Darksteel Citadel
3 copies - 1.5 average
Relic of Progenitus
3 copies - 1.5 average
Sword of the Meek
2 copies - 1 average