RT.
The shards serials is so unbalanced, especially sof which become the standard card in gold and plat deck. And all around shards serial to design deck ,which decease the freedom for try design different deck. And let all player just do 2 things : arena to win shard, pvp use shard. So what is the live meaning of the other cards? The attraction of this game is the abundance cards of so many series, and many strategy including energy suppress, rush with creature, poison, and ect. But now I only see one strategy , use sof to energy suppress, so boring, that decrease many people' interest. And for them , only two way , go away or go grind arena.
I think the good way is not making the shard card so unbalanced to abstract people play arena.
The unbalance of sof is not the function but the cost, this should cost fixed type energy so that people cant play it in the first turn, which makes the game luck based to see who can play sof in first turn.