Good questions, thanks for asking them.
1- Yes, in general Scars block cards will be (and have been) on the decline due to rotation. However, it's standard season, so if the deck has any teeth, people will be playing it. I didn't mean to suggest investing in the pieces, but maybe if you've seen the deck in action and it's nasty it would be a good gamble. More importantly, anything you were unable to unload that fits that deck, may now find trade partners at your LGS.
2- I should have at least given a mention to Odric, I think he's a fine card, just somewhat narrow, and he competes with the Angel at 4-drop. I don't expect him to be a huge card, but he'll be a card, and his current price of $2-3 is more than I'm willing to gamble on a 4-drop.
3-possibly, we still have SOM for the remainder of the summer, but there aren't any big cards i'm willing to gamble on from that block prior to rotation, and innistrad block just had so few playable artifacts. These colorless lands seem awesome in a primeval titan deck that can tutor them at will, at a minimum. Further, it rewards 1 and 2 color decks for having the ability to play them. Your deck simply needs to be aggressive enough where you can afford to "Miss a land drop" and be okay, because when you play the Cathedral of War, you get no mana, and the following turn you only get colorless. It reminds me of a better contested warzone, because you never lose it, it doesn't cost mana to activate, but it only pumps your lone attacker.

thanks for the questions.

I like lili a lot too. I still haven't had enough time to think about where she'll end up, and this morning we saw Ajani, which i really think will be the big splash, but both will be seeing play, no doubt.