You could play Limited, where everybody gets six booster packs. Everybody opens one pack, takes a card, and passes the remainder to their left. Once the first p

You could play Limited, where everybody gets six booster packs. Everybody opens one pack, takes a card, and passes the remainder to their left. Once the first pack is all picked up, everybody opens their second pack, takes a card, and passes the remainder to their right. Repeat until you're out of booster packs. Now you have 6*15 cards, and you need to compose a deck of at least 40 cards out of them. You can add as many basic lands as you want. Play your deck against everybody else's. This avoids the idea that you can just buy strong cards to win, because you only get what's in the booster packs. And if you take only the strong cards from each booster, there's no guarantee that your deck will actually function as a deck - do you have a good mana curve? Are all of your cards the same colour? Even once you start drafting to put together a deck instead of just grabbing all the strong or rare cards, you have to figure out which colours the people upstream from you are drafting so that you can try to draft the colours they're passing over, otherwise you'll be competing for the cards they want.