The art in each land showed a thriving, beautiful plane
Theoretical Duplication is a fantastic way to keep up with any opponent that tries to advance too quickly, or just to grab yourself a copy of a sweet creature your opponent is getting
If any part of that creature's head is higher than the bottom of the bar (that is, if it would hit the bar), the creature is a legal target
You regularly saw 6+ mana worth of cards cast on turn 1 Eye of Ugin
But not updating all the cards that came before, (which wouldnt even be that many cards since werewolves showed up in just two blocks before) makes it really hard to build around them
I expect that your ability and willingness to buy pretty much everything, including bulk common/uncommons and bulk rares will sway people in your favor who want to get rid of everything in one fell swoop