parakkum

Viper Rock

This is a Rock-ish build that's full of utility critters. Walls and Elves provide mana, Vipers draw cards, Darkhearts block and give life, Shriekmaws double as removal, and then Nath and the Stalker finish things off. The sideboard is meant to allow some additional tailoring against aggro, especially burn-heavy variants (for which life gain off the Hammer should be handy -- at the very least, to draw burn to the Hammer-equipped critter instead of you), but most of its focus is on matchups against control builds.

Goblins!

A straightforward Goblin aggro build. Perhaps the Gargadons aren't necessary, but I always appreciate having them there as both a looming threat and a way to mess up targeted spells that have some other benefit (are there a lot of those in the current Standard?). I expect Knucklebone Witch to be a lot of fun.

Righteous Hatred

I do like the black/white control, but I also like drawing cards, so this version of tapout control dips into blue for Foresee -- and, incidentally, some Delays. Just staring at it right now, it maybe needs an Urza's Factory. I like the "remove anything" feature of Oblivion Ring. Handy, that.

Fire!

Straight up mono-red Flamekin (relying on the Smokebraiders to power out the sideboard elementals). I don't know about the deck design as a whole, but Ashling is brilliant. So far, this deck has rolled out like so:

Turn 1: Harbinger, set up Ashling or Braider as needed
Turn 2: Smokebraider
Turn 3: Ashling, pump Ashling to 2/2 with Braider
Turn 4: Pump Ashling twice, she swings in at 4/4 and just keeps growing, then blows up as needed

I pack the full four because I expect her to eat removal pretty frequently. Even so, she's great, and is a threat that doesn't let up.

Teachings

I've only ever played Teachings decks (Dralnu?) in Time Spiral block, so this may be too heavily geared against, say, creatures, and it lacks the multicolor nature of typical TSP block Teachings builds.

Elemental Cupcakes

This build combines the ability to tutor and evoke elementals with the card-drawing engine of Jhoira with Chronicler. Play out the Flameking Harbingers to set up your draws, use Mulldrifters primarily as draw spells, and then slap down Jhoira and a suspended (for 4) Chronicler the moment you hit five mana. Skred, Ring, and Wrath keep you alive against aggro decks (as do Jhoira and the Harbingers as handy chump blockers). Finishing comes in the form of Guile, Purity, Hoofprints, or just overrunning the opponent with elementals and avatars. The sideboard offers a bit of a transformative option with Hostility and a suite of burn.

Collusion

This B/G build makes a go at using Demonic Collusion as a tutor to power out a whole lot of one-ofs, on the back of a basic framework of robust four-ofs, with Vipers for draw, Darkhearts for blocking and life, Gemhides for mana, and Screechmaws for removal. I threw the Wurm in because you could (very theoretically) play out it while searching your deck with a tutor. If you can get multiple Darkhearts and Gemhides in play, that idea might be less silly than it initially appears (or, perhaps, not). Once I went with Gemhides for fixing, and given the tutor nature of the deck, it made a lot of sense to throw in one Virulent to allow the possible poison win.