The multiplayer game Archenemy pits each player against one other player and uses 3.5x5 Scheme cards that are meant to even the playing field
Maximum interaction (which means cards that are hard to interact with are more likely to be cut, so no planeswalkers, limited shroud, only temporary spells/abilities give unblockable effect)
GrimDeck's free tier tracks up to 10,000 cards with price data and set completion, which is enough for most players to start organizing
There are numerous platforms for selling Pokmon cards online, such as eBay, where you can list your cards as single items or in an auction format
thats right, its the classic interaction section that nobody likes and everybody needs to compete in a game of Magic, of any format