Green shards? To you mean the Galactic War tokens? That's different from the Shard Shop.
I'd hang onto the green shards, they have slowely been adding heroes to different areas of the game. There may be some new heroes in there in the future and you'll be all set!
And on sidenote, i just counted how many gw tokens i need to put to max * chars i will love to lvl up and/or try...and ended up at 20k tokens..and after this is done it will be very easy way to convert them to shard shop currency or just to buy usless chars so they can sit at lvl 1 waiting for chalenges or events to train and gear up them.
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Green shards? To you mean the Galactic War tokens? That's different from the Shard Shop.
I'd hang onto the green shards, they have slowely been adding heroes to different areas of the game. There may be some new heroes in there in the future and you'll be all set!