Theres also one more problem if both you and your opponent have Leyline of the Void in the opening, Dredge is still disadvantaged
Shuffle Your Deck Part and parcel of not just the Pokmon TCG rules, but every card game, is to shuffle each players deck before the game starts
In Magic, preconstructed decks built for the Commander deck are common, and are often released alongside major set releases (and in some cases, on their own)
MTG Basic Rules : Players use decks of at least 60 cards, casting spells and summoning creatures to reduce their opponents life total to zero
What's the difference between a single card, a pack, and the MEGA card
Similarly, by playing the card, you are delaying the game by starting a new one in the middle of the current one