I didn't get to claim my prize. and it seems no longer valid
What price are you referring to?You couldn't be a signature participant as it was not opened for newbies and if you meant Twitter or other bounty,well then you are not along as nobody got paid.
I don't follow the campaigns, but if not mistaken I can gift from lottery
I forget the draw what it is? then I can't access the cgc website and didn't get to claim my prize
Yes, you won a in-game prize in the lottery (coupons for rare boosters, a few game credits to test the p2p market engine, "cool art" basic MTG lands).
How to claim it? Download the game, and graphic module if you wish, launch the game and register a new player.
Then PM us to schedule a guided tour of the platform and get your prizes.