After screwing around with different decks for a while (BUG Control, BUG Thresh, 4c Control, Grixis Delver, etc), I finally came back to Old Faithful and immediately 5-0'd, beating Doomsday, MonoRed Painter, BG Depths, Death & Taxes, and BUG Control. List below:

Creatures: 16

4 Delver of Secrets
4 Deathrite Shaman
3 True-Name Nemesis
2 Baleful Strix
1 Snapcaster Mage
1 Leovold, Emissary of Trest
1 Gurmag Angler

Inst/Sorc: 25

4 Ponder
4 Brainstorm
4 Force of Will
3 Daze
3 Thoughtseize
4 Lightning Bolt
2 Abrupt Decay
1 Fatal Push

Lands: 19

8 Blue Fetches
3 Underground Sea
2 Tropical Island
2 Volcanic Island

Sideboard: 15

2 Invasive Surgery
2 Surgical Extraction
2 Pithing Needle
1 Hydroblast
1 Pyroblast
1 Flusterstorm
1 Grim Lavamancer
1 Garruk Relentless
1 Diabolic Edict
1 Umezawa's Jitte
1 Sudden Demise
1 Ancient Grudge

I really, really like this configuration, and the fun-off Garruk Relentless more than pulled its weight. Other than Burn, UR Delver, and Blood Moon decks, I don't really fear anything with this build.