can you use old pokemon cards in tournaments You Can STILL Use These

For example, Rhystic Study is an EDH enchantment staple that would fit this deck well, but its also a $60-80 card

That would be fine

With past Secret Lair Commander deck releases, the impact has been small because the decks typically sold out in a matter of minutes or hours, but the long availability of the Angel deck suggests that perhaps the supply is higher than in the past, which is allowing the deck to have a bigger impact on prices

Dirty Rat forces an opponent to discard a card when it enters, while Stinging Scorpion gives a creature an opponent controls -1/-1 until the end of the turn

CGC 10s for a mini-set etc.) I think CGC will be fine, but: Will it always be at a discount to PSA for the foreseeable future