First of all, Blue Elemental Blast is probably the most underappreciated card in the universe. I can't tell you how much this improves Goblins, Random Janky Red Aggro (See Dryad Sligh), and any combo match that relies on any form of Red Acceleration. It also stops Blood Moon, which is crucial. (Note I said Blood Moon, not Magus of the Moon, which is janky and retarded and floating white or black for STP or Edict or already having a Deed in play is sufficient to axe that idea.)

Survival is a hard match to pinpoint because depending on the build, it can go anywhere from 70-30 Landstill to 70-30 Survival. Game one, winning is as simple as keeping Survival off the board and keeping Genesis out of their graveyard. In subsequent games, you get tools such as Extirpate, Krosan Grip, and (if you run it) Spell Snare, all of which help drastically here. Crime//Punishment, if you run it, will shine here, allowing you to steal Genesis out of their graveyard and in the event they find a way to kill him, Swords the bugger. RGBSA is not a match worth panicking over. It's no worse than even if skill level is even, and it's highly unlikely you'll see it anything but once or not at all in a given tournament, making metagaming heavily for it a questionable proposition.

Aluren I've never found to be all that bad. Therapy and Force or not, almost every card in your deck is useful against Aluren in some capacity, and they have to resolve Aluren to beat you. Aluren might be able to beat some decks down in a pinch, but it's not going to do it to one with the creature hate capacity of Landstill. I think a lot of the bad results from Aluren are because for some unknown reason nobody ever takes the time to playtest against it and learn what they're up against. I've seen very solid players play like complete idiots against Aluren, and I'm no exception.