Most played cards in Nadu:

4 Decks
Brainstorm
16 copies - 4 average
Swords to Plowshares
16 copies - 4 average
Force of Will
16 copies - 4 average
Nadu, Winged Wisdom
16 copies - 4 average
Misty Rainforest
15 copies - 3.75 average
Nomads en-Kor
15 copies - 3.75 average
Green Sun's Zenith
12 copies - 3 average
Consign to Memory
12 copies - 3 average
Prismatic Ending
11 copies - 2.75 average
Ponder
11 copies - 2.75 average
Flooded Strand
11 copies - 2.75 average
Delighted Halfling
10 copies - 2.5 average
Tundra
8 copies - 2 average
Carpet of Flowers
8 copies - 2 average
Tropical Island
7 copies - 1.75 average
Windswept Heath
7 copies - 1.75 average
Veil of Summer
6 copies - 1.5 average
Force of Negation
5 copies - 1.25 average
Teferi, Time Raveler
5 copies - 1.25 average
Savannah
4 copies - 1 average