We are playing 4 Stifle... why not adding a single (or two) Dreadnought?

4 Tombstalker
4 Tarmogoyf
2 Phyrexian Dreadnought

4 Brainstorm
2 Ponder
4 Stifle
4 Force of Will
4 Daze
4 Thoughtseize
4 Smother (I definately prefer over Snuff Out)
4 Sinkhole

4 Wasteland
4 Polluted Delta
4 Flooded Strand
1 Bloodstained Mire
4 Underground Sea
2 Tropical Island
1 Bayou

Sideboard:
4 Tormod's Crypt
4 Blue Elemental Blast
4 Krosan Grip
3 Pernicious Deed (Over Diabolic Edict... a lot of tribes/affinity depending meta)

What do you think?

I'd Like also to include Hymn to tourach... this card is GREAT but what goes out?