Even if you do not have the Pro status in mind, you should still train your cards continuously in order to boost their stats and make it much easier for you to win. Early on in the game, however, you should not focus excessive on training your players and rather you should just concentrate on hoarding cards: you can hold an optimum of 200 at any provided time, and I would suggest to continuously wait to reach the limitation prior to going on an upgrade spree.

I constantly use the very same method when it pertains to handling upgrades:

When I initially start playing, I wait till I get 75 cards under my belt prior to beginning to upgrade my finest. I use 10 cards to level up my leading 5 players once I reach 75. This leves me with a deck of 25 cards, which is the amount required for 2 on 2 and the optimum needed by any game mode.

After this, you will have your main cards at level 4, which is good ... and a lot of work ahead.

Start playing the lengthier game modes and get more card choices. Wait till you have 100 cards, and go on an upgrade spree once again (do not forget to do it just after you modify your decks to ensure that you have the very best cards chosen in all game modes!).

Do your 3rd upgrade spree at 150 cards-- this will take some time, however it ends up being simpler and simpler as you have much better cards to play with and more alternatives.

Constantly start dealing with your leading 5 cards (in regards to rarity initially): in this manner, as you play and get more cards, rarer cards will replace the ones you have actually currently updated to level 4, they will get to a good level too and at the exact same time help you build a strong deck for the other game modes. Functions like a beauty!