And these days everyone and their mum gets crazy bears. But it's okay because the good bears are rare, so they'll be incredibly expensive, which is what matters.
edit: Last good block was Khans of Tarkir. I had a big box full of cards and decks running from return to ravnica up to two sets past khans and I've lost it in the move and it sucks so much. I had this kickass Rakdos Deck I would bust out whenever I was teaching someone how to play, gave them my bulk (plus a few good rares, so they would have some inspiration) and at some point they would be feeling their oats, thinking they were big adults now. That's when I would break it out. It always worked. It made them want to beat the shit out of my deck, and next kitchentable session they'd bust in with some weird construction they'd tinkered with to fuck with me. Maybe even bought a few singles to get it going. Usually it would take them a few tries of deckbuilding, and it was so wonderful when they finally beat me.