Most played cards in Prime Speaker Zegana:

3 Decks
Remand
3 copies - 1 average
Tropical Island
3 copies - 1 average
Scalding Tarn
3 copies - 1 average
Riptide Laboratory
3 copies - 1 average
Eternal Witness
3 copies - 1 average
Windswept Heath
3 copies - 1 average
Wooded Foothills
3 copies - 1 average
Green Sun's Zenith
3 copies - 1 average
Mystic Snake
3 copies - 1 average
Jace, the Mind Sculptor
3 copies - 1 average
Pendelhaven
3 copies - 1 average
Temporal Mastery
3 copies - 1 average
Polluted Delta
3 copies - 1 average
Venser, Shaper Savant
3 copies - 1 average
Cavern of Souls
3 copies - 1 average
Cryptic Command
3 copies - 1 average
Snapcaster Mage
3 copies - 1 average
Flooded Grove
3 copies - 1 average
Counterspell
3 copies - 1 average
Primeval Titan
3 copies - 1 average