Most played cards in Azorius:

4 Decks
Hallowed Fountain
14 copies - 3.5 average
Dovin's Veto
10 copies - 2.5 average
Opt
8 copies - 2 average
Teferi, Time Raveler
8 copies - 2 average
Hushbringer
7 copies - 1.75 average
Castle Vantress
7 copies - 1.75 average
Time Wipe
7 copies - 1.75 average
Glass Casket
7 copies - 1.75 average
Narset, Parter of Veils
7 copies - 1.75 average
Tranquil Cove
7 copies - 1.75 average
Prison Realm
6 copies - 1.5 average
Sinister Sabotage
5 copies - 1.25 average
Stonecoil Serpent
4 copies - 1 average
Aether Gust
4 copies - 1 average
Steel Overseer
4 copies - 1 average
Locthwain Gargoyle
4 copies - 1 average
Gingerbrute
4 copies - 1 average
Inquisitive Puppet
4 copies - 1 average
Gods Willing
4 copies - 1 average
Winged Words
4 copies - 1 average