More classcards for Wave Mode, Super Soldier and Power Plant.

Doppelcorny1

Adding an event or special day in Crossfire for obtaining more classcards in one game would be an ideal chance of leveling multiple cards at once. Most of the time after a Wave Mode game is completed there is no reward at all. No EXP gain for tower distruction nor a new card to level.

adigagever92

You can buy Joker with GP......

RiceTurtle

I agree, it would be fun to have a WAVE event. I was on hiatus when the mode first came out and I feel like it's now impossible for me to get 1k wins since hardly anyone plays that mode.

As far as leveling up goes, there's a Joker card in the item shop for 1,500GP. You can use it to level up any other class card (in case you didn't know).