For better or worse, it seems that only the worst of the worst cards are getting banned
Cards with alternate art, promos, or low print runs in foil form can fetch a decent price
Alternatively, attending local trading card events, and conventions, or visiting dedicated Pokmon card shops can provide opportunities to buy, sell, or trade Rainbow Charizard cards in person
If anything, adding MDFCs has added a whole new axis of deck-building and increased the range and complexity of decision-making around land drops to a level usually only seen in formats with Wasteland and Brainstorm
The chosen effect can be from any source, including one controlled by an opponent
Most of the time, you'll be trading from a binder full of the cards you're looking to swap