Most played cards in Threshold:

1 Decks
Stifle
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Scalding Tarn
4 copies - 4 average
Wasteland
4 copies - 4 average
Ponder
4 copies - 4 average
Force of Will
4 copies - 4 average
Misty Rainforest
4 copies - 4 average
Tarmogoyf
4 copies - 4 average
Brainstorm
4 copies - 4 average
Delver of Secrets
4 copies - 4 average
Daze
4 copies - 4 average
Minor Misstep
3 copies - 3 average
Pyroblast
3 copies - 3 average
Volcanic Island
3 copies - 3 average
Tropical Island
3 copies - 3 average
Murktide Regent
3 copies - 3 average
Surgical Extraction
2 copies - 2 average
Run Afoul
2 copies - 2 average
Meltdown
2 copies - 2 average
Rough // Tumble
2 copies - 2 average