There are just a raft of cards (mostly Modern) that are about to explode in price, or are in the process of doing so.
So, in the interest of time, the next few updates will be short and sweet.
Momir Vig is popping under Commander, casual and possibly Legacy demand. The recent Blue-Green Naya Commander 2015 deck is reminding folks of the Grandaddy Commander for creature-based blue-green. I had this guy as a curve-topper in an Aluren deck; he is wicked. Can be an engine, and can quickly enable run-away combos.
Non-foils are flying upwards past $6 and Foils are gently (soon violently) pressing upwards on the $30 price-point that has been established for 2 whole years, now. It will not hold for long.
A spike within the next couple weeks takes the non-Foils to $15, settling down to $12. That spike hits the foils very shortly afterwards, and takes them from $30 (now) to $75 briefly, before settling down to $50 (if you can find a NM Foil, that's your long-term sure-money bet). Commanders sees very high foil multipliers.