It says 0 because Konami hasn't put in synchros yet, notice how the card next to the extra deck is purple, like fusions. Its almost as if fusions are purple and it's a 0 because he has 0 fusions.
Can confirm this.
It's 0 because he didn't put Fusion monsters, this is funny the game don't fully recognize Synchro yet, even in the player profile, there's no Synchro Summon Performed.
If you look closely the Extra Deck text on top, it said 3 though, this is probably real.
Anyway, what's up with 3 Stardust and you become salty?
Anoymous
¯\_(ツ)_/¯
