Games

That's a really superficial take. For instance in MTG every format has "must have" cards, like fetchlands or shock lands (or dual lands), but beyond that there's no "best" cards. There are "meta" cards that go into a specific meta deck and when you have one meta deck playing against another that's when skill and strategy come into play. And it's not like you must build a meta deck to play, you can build anti-meta decks or lab out a completely new meta deck. The problem is that such a level of deck building skills go way beyond what 99% of players are capable of doing. Even some of the best players in the world suck at deck building, because is an entirely different skillset to playing the game.

But it doesn't mean it doesn't happen. The modern meta looks very different to when I got into MTG 10+ years ago. Some are still around in some form, like regular Tron turned into mono-g tron and burn turned into boros burn. But the bans on Twin and Pod have killed those decks while Jund and Affinity have dropped out of the meta. In those place we have brand new decks like amulet titan or 5c Omnath. Somewhere in that timeframe we also got Eggs that was literally jank cards thrown into a pile of meta-defining solitaire playing, and then it got banned for being too boring.

You can get meta cards to build a meta deck but you can't explicitly buy "best" cards because a new combination of "bad" cards can create a meta deck and then those become the new "best" cards.