Magic cards aren't worthless after two years. Commander is one of the most popular formats, can (and tends to be) fairly casual, has a low barrier of entry at this point, and only a small handful of cards can't be played. The rest of Magic's entire card pool is completely legal. I won't even bother touching on the other eternal formats, which have already been neatly covered by someone else - and conveniently ignored by others, like yourself.
People who haven't played a game in 15 years really should stop throwing in their two cents about it. It's embarrassing.
Attacking strangers on the internet is also embarrassing, but I'll let it slide. If you'll scroll up a bit, you'll note that I was talking about standard play. I'm not interested in fan created formats, adopted officially or not, that allow one to play with cards that are otherwise illegal in standard play.
I didn't say I haven't played ANY games in 15 years. I didn't say I haven't followed the game for 15 years. Who knows... maybe I even worked at a gaming store in the last 15 years (I did), which would give me some insight into the game without having to play it.
Ultimately, neither of our opinions matter at all though. Destiny isn't Magic. Magic is obviously popular, but there are many, many people out there who hate lots of things about it, including the aggressive rotation schedule for standard play. Many players are only interested in learning one play format and will usually default to the standard play format.
I realize that we live in a post-fact era, but acknowledging that certain facts do exist and then choosing to ignore them anyway doesn't do much to strengthen your position here. You've been told three times now by more informed players than yourself that there are several viable and popular formats, an inconvenient fact that wholly undermines the only thing remotely approaching a reasonable criticism of rotating card sets. Please don't let there be a fourth.