mtg 13 card M13 Intro Packs if you have exactly thirteen cards in your hand Magic the Gathering M13: MTG:

You can also buy the new Traveling Chocobo cards, which even had their own teaser trailer featuring a limited edition Gold Chocobo

Dragon Shield will be your favourite brand if you dont mind a bland design but appreciate the high-quality sleeves that wont break the bank

In addition to the obvious things like Syphon cards (do some effect to each other player, gain benefits depending on how many other players this hit), there are cards that affect a random opponent, cards that give everyone the game the ability to join forces to create a big effect (for example, a sorcery that lets everyone pitch in mana and then lets everyone put lands into play from their decks), and Enchant Creature cards sorry Auras that boost the creature while preventing it from attacking to

I know its mana cost is absurdly high, but this card as your commander means having the ability to exile any two permanents from the field at almost any given time