I still have my Latios Ex and Raichu Ex... Ah, good times, good times...
EDIT: And who can forget Team Rocket's Mewtwo Ex?
Oh yes, but those EX's are no match for the pokemon in todays format (like decks themed around Zekrom+anything, Reshiram+Emboar or Typhlosion, Cobalion+anything)
These new EX's coming out will stomp any deck using the current format. My deck I have now uses 4 Zekroms, 3 Virizions, and a 2-1-2 evolution tree of Serpirior (that means i have 2 snivy, one serivne, and 2 serpiriors. and 3 rare candies to skip servine if/when possible) Serpirior sits on the bench and heals all my pokemon for 10HP each turn (20 if both serps are out) and i start the game with Vrizion, who can double draw, and once he has a grass energy can hit for 80 dmg per turn(as early as turn 2). Then if the game doesn't end with Virizion, I use zekroms second attack, which does 120 damage to the enemy's active, plus 40 dmg to himself in conjunction with serpirior, and eviolite(which reduces all damage to the pokemon attached (zekrom) by 20) so that he can do the 120 damage without actually damaging himself at all. Plus everything else gets healed so I can retreat a wounded Zekrom for another that's been powered up over time!
Sounds like a great deck yeah? Zekroms's 130 hp, and 120 damage attack is no match for ANY EXs coming out. Too bad so sad.
To serebii!