Hero levels

So I’m relatively new here and maybe this has already been discussed in detail but is there anyway to get the cards needed to level up a hero without spending tons of diamonds on recruit chests and crossing your fingers? My Giga is stuck at level 35 while all my decks units are at 40 because I can’t turret cards to save my life. Why is hero level tied to deck card levels? I mean I believe you should to keep a balanced deck but shouldn’t that be player choice?

They want you to gamble on chests to buy the cards. There are no alternatives other than daily deals in the shop with gold.

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