Magic the gathering

Words is suggesting something that is not only very expensive, but very hard to play. You can definitely build a good casual deck for 50 bucks. 500 is a pretty reasonable budget for a tournament quality Standard deck, and the only reason you'd need to spend more is because there's a bunch of old cards that are insanely overpowered that run over 100 bucks each.

By the way, check out tappedout.net for a place to build a deck and browse other peoples' decks. It calculates the price of the deck, too, if you end up wanting to buy it.