Some of the best places to sell your Pokmon cards are: TCGplayer lets you individually list your cards for sale, or lets you set up a bulk lot if you want to make money off of your entire collection
Fight based removal is also the easiest to get blown out with: pump spells, removal, or bounce spells can turn the fight against you
WUBRG: If you control Applejack, Fluttershy, Pinkie Pie, Rainbow Dash, and Rarity, everypony wins the game
Theres also relative newcomer Inkshield, which, while expensive to cast, will easily set you up for the win on your next turn
The Markings are in great places for pro work...these are not for gambling, you are not going to take these to poker night and not get run out on a rail...it's not that kind of deck