The tension between fetching for the 'best mana' verses playing around B2B/Moon is good because it creates dynamics and decisions, which is interesting (compared to everyone playing a minimum three colours with lots of doubles)
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The most valuable cards so far include Avatar Aang (Borderless) at around $135, followed by Badgermole Cub, Ozai, the Phoenix King, Sozins Comet, and White Lotus Tile, all ranging between $59-$65
You'll also see copies of Gideon, Ally of Zendikar (planeswalkers are great examples of reach) as well as Always Watching, an enchantment that gave your team +1/+1 and vigilance, keeping them relevant even if your opponent managed to play some big blockers
General bias toward traditional work (which could be just me)