You can only activate 1 The True Sun God per turn
Not much is known about the adult Gressle, but he was interviewed in 2015 by high end card collector Asianyensation, where it was confirmed via Instagram that Tyler still owned the card
Often, these cards require specific spell cards to summon, meaning that the combos of these decks are streamlined, but they are also easy to interrupt with handtraps that stop these summons from resolving
A card's attacks are derived from a page's Pageviews x Rarity Multiplier, with a limit of 15,000, designed to represent an article's "fame." The defense is determined by a page's Content Length x Rarity, again with a max limit of 15,000, designed to represent an article's "detail"
Each of those Decks must be legal for play (appropriate number of cards in the Main Deck, complies with the Forbidden and Limited list available within the MASTER DUEL app)