My lessons:
Don't underestimate Stonework Puma - it's a nice late pick, good for your allies and playable by itself in every deck.
[[Stonework Puma]]
Zektar Shrine expedition is very useful, especially if you can get your hands on Electropotence - you can hit for 14 on turn four. Even without it, Zektar is IMHO the best expedition by far -- it's always there for a nice 7 damage (+ trample!) and it can serve as potential removal by just being there, waiting to block your opponent's best creature.
[[Zektar Shrine Expedition]] [[Electropotence]]
There are some great 2 and 3-drops in red. Red aggro is definitely one of the more playable choices in this format, with Goblin Bushwacker (and the shortcutter), Hellfire Mongrel, and even Ruinous Minotaur (awesome cheap one-time-blocker, and when your opponent is down to 10 life you can definitely pay those two lands to finish them off).
[[Goblin Bushwhacker]] [[Goblin Shortcutter]] [[Ruinous Minotaur]]
As for the ascension, Beastmaster and Luminarch are definite bombs, whereas the others not so much.
[[Luminarch Ascension]] [[Beastmaster Ascension]]