The card leveling system has a limit for non-gold cards. That means once a common card reaches level 6 that's it, no more leveling up, it's at MAXIMUM strength.
It takes a lot of cards to make a level six card. It takes:
1 LEVEL SIX
2 LEVEL FIVE
4 LEVEL FOUR
8 LEVEL THREE
16 LEVEL TWO
32 LEVEL ONE
With the going rate for a common level one blue frog being 250 volts, it would take 32x250= 8000 VOLT to get to level 6. That's about $8.00 per card!
Even having two options of level six common blue cards, neither of these are strong enough to advance my journey. I'm pretty much stuck.
I completed the Protection with Armor adventure, the last quest granting almost 100 XP per win. But i'm stuck half-way through the next adventure.
This is the quest the does me in every time:
I used to attempt this quest, (always loosing), but now the game forbids me from even trying.... I guess my level is still to low.
Hmmm... Guess I gotta grind some more. Get those levels up! Earning less than 100xp per battle, means I still have about 140 more battles to go. That's a heavy lift!
Feels tiring man.