Here's what it says on the FAQ about Ex Level.

"Ex Level
If you clear a One-Shot Mission's corresponding mission, your Ex Level limit will increase.
After an Ex Level limit is unlocked, you can raise all your cards to the upper limit."

Safe to say in this version of the game we've not encountered any of those missions yet. I got an Ex Card as part of my reward from the event (rank 25 whoo!), finished story mode in its current state, turned in the quests and I can't use my Ex Card.

Cong on you top 25!

Players who finish in top 5 got 3 Ex-Wild in event.
Players who finish in top 6-10 got 2 Ex-Wild in event.
Players who finish in top 11-30 got 1 Ex-Wild in event.
I think top 30 costed 100$s of dollars for all players.
For most players it cost tons of items to get a ex.Wild and it is one of the hardest and most expensive item to get atm.
There are one exception to this:
Players at stage 1-3 might where spins just cost 1 stamina can get one Ex-Wild per 3-4 days without spending any items.
I know because I stock pilled 5 Ex-wild before going to area 5-3.

What I want to say is that area 1-3 is crasy overpowered atm. No stage should have spin cost under 3 stamina imo.
Bonus Stage and GHQ should have there spin cost reduced by 50%. Strange that this game have been out to long in Japan and things like this have not been gixed jet!!

Free players might still get Ex-Wild if then collect 300-400 N-Gacha and use them all at same time.

Maybe it will be open after pvp event. Crap, i wasted a lot of resources.

I used 21 peronamin and failed twice to get ex card (2/3 before daily reset).