Puzzle time 1:
I simply don't think this can be done like this. Lands deck differ a lot from one to another, and this is a SB game, so you would be able to see what he brought up. Also, I don't know exactly how the board is and how his grave looks like. Deal is depending on the situation there are multiple different acceptable answers. Maybe Tabernacle might be the right choice. Maybe Wastelands. Maybe Grove or P.Fire. Maybe Loam. Probably Loam. With a Stage into play and a Depths in the grave, I'd be inclined to take either Loam or more Depths, because that can kill you in a couple of turns, whereas the rest can mostly stall.
Puzzle 2: Gezz, this is a tuff one. That fetchland really screws your scry. I would resist all my urges and not crack it T1, to draw the Waste and then play Lackey, hoping to draw a 3rd land to Blood Moon him out of the game. Still, maybe Lackey would have won you the game, or maybe he would play a blocker and you'd never find a 2nd or 3rd land. Either way, I think you'd need to be lucky with either line of play to win.
Elves: My side out would be 4 Vial, 3 Ringleader, 1 Piledriver for 4 Shooter, 3 Needle, 1 Squad. Imo the early interaction from Therapy is good here. They're too fast. Vial is too slow, and since you don't run Ports and only 2 Wastes, I don't think it pull it's weight (you would have won G2 without that Vial as well as soon as the 2nd shooter hits play). Since you have 4 Shooters and 4 Matrons I don't think you need Ringleaders to find them, and this is not a MU you need to refill resources. Once you're ahead, they'll either Natural Order a Progenitus and try to kill you, or they'll just lose. And because of that a 2nd Squad comes in.
Congratz again there. I do think the RB list is better suited nowadays. But we do need to figure out how to improve Shardless MU, because it is quite a hard one.

