The coin is there to counter the disadvantage of going second. However in it's current state it is not an equalizer, but an (unfair) advantage for the player who goes second.
My proposal is to have the coin you get from going second ONLY give you one mana crystal. It shouldn't count as a spell / card and will not work as a combo enabler.
Coins generated later in the game can work as normal.
What do you think?
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