About which packs to buy, actually it does not matter that much since the probability of getting what you want is low, but, to maximize it, Id recommend getting Amonkhet for Hazoret the Fervent, Glorybringer, Ahn-Crop Crasher, Magma Spray and Sunscorched Desert
The Generation banlists also exist that filter by generation (DM, GX, 5Ds, Zexal, Arc-V)
In conjunction with both of these introductions, Special Set Pokmon Horizons: The Series will be released in Taiwan and Hong Kong on 2 August as well
It has protection from White and Black, gets a +1/+1 counter on it whenever you cast a creature, and makes creature spells you cast one mana cheaper for each +1/+1 counter on it
Perhaps you cant even main your favorite type because it just doesnt seem to exist in the TCG