Mana acceleration beyond those mana rocks is limited, but there are still a handful of useful options
Starmie Ability: Fishy Star Once during your turn, you may put 2 damage counters on 1 of your opponent's Pokmon
I could also imagine Rishkar, Peema Renegade in the deck to push your manabase in early turns
While the type has been expanded greatly over the years (now boasting over 260 unique creatures), the ideal Angel remains a potent flyer with some sort of notable ability, a la Avacyn, Angel of Hope or Archangel of Thune
Red-Eyes Dark Dragoon Red-Eyes Dark Dragoon is an absolutely terrifying card
If you want unique artwork (as opposed to holo/non-holo variants) here are the remaining Japanese exclusive arts: Rayquaza ex from the Gift Box Emerald Rayquaza ex from the Master Kit Deoxys ex from the Gift Box Emerald (non-holo) Ho-Oh ex PLAY promo Lugia ex PLAY promo Jirachi ex PLAY promo Latias ex from the Latias/Latios Gift Box Latios ex from the Latias/Latios Gift Box I think thats all of them, but I may be missing some