As much as I love Crystal Beasts as an archetype, summoning Rainbow Dragon is almost impossible in this format. Magical Merchant and Grass ain't helping much...
Also, Jesse's exclusive skill is pretty underwhelming.
Well i would say that it actually is possible with like 30 cards deck and the spell card that forces you to Put cards into the graveyard until it equals your enemys Decks card number
I've actually managed to build a deck that can summon Rainbow Dragon regularly enough - and if not, makes it possible to win without it. Just gotta know the right combination of cards to use and I gotta say, it's definitely fun in KOG.
pls show me. I only got a crap crystal deck with grass where i could never play Rainbow dragon. For a monster that is so easy to overcome in this meta, the summoning is quite hard.