It's your deck, after all
Clones take many forms, pun fully intended, but the traditional use of the name refers to shapeshifting permanents that either enter the battlefield as copies or copy something else at a later time
For one, we can run the deck Id run right now if I were playing in a Standard tournament, G/W Aggro: Creatures (20) Planeswalkers (3) Lands (23) Spells (14) The reason I like this deck is that even if your opponent takes something with Thoughtseize you still have plenty of hard hitting action coming right behind it
Here is a first look at the chase cards (according to Reddit): Pokmon 30th Celebration ex and Classic Cards Pokmon 30th Celebration Alt Art Cards Every Pokmon TCG 30th Celebration Card Revealed So Far While the leaked images arent the best quality, eagle-eyed players have managed to figure out most of the 30th Celebration set list
Hopefully, by the time we're done, we'll have a better idea of just why these cards are so important, what decks they fight against, and why, when you are building a deck, you should be including these effects somewhere in your 75