Yeah, Ravnica was my time too. You'd be surprised at how many older cards are still relevant though. I like to go to Wizards's Gatherer and just hit "random card" a bit and browse. Check the user ratings for each card. It's fun. By the way, one of the "big nine" or whatever they're called, is a blue card that's ONE mana to draw THREE cards. Talk about OP.
Yep, the random card button is one of the best time sinks.
It's sort of annoying that you kinda need to have tons of counter and destruction cards in your deck to be prepared for every op thing your opponents might have.
Well, unless it's lolproof.