MTG Salvation

So I am getting ready for the GP in Portland next weekend. I have been play testing a BUG seasons past build that is similar to Ali Aintrazi got second with at the scg Columbus Open. Was looking for outside thoughts on the deck and sideboard and some suggestions for either.

Creatures
1x Den Protector
1x Emrakul, The Promised End
1x Ishkana, Grafwidow
2x Jace, Vryn's Prodigy
1x Kalitas, Traitor of Ghet
1x Nissa, Vastwood Seer
4x Sylvan Advocate

Enchantments
2x Oath of Jace

Sorcery
1x Collective Brutality
2x Dark petition
4x Languish
2x Ruinous Path
1x Seasons Past
1x Traverse the Ulvenwald

Instants
1x Grasp of Darkness
1x Murder
1x Pulse of Murasa
2x Ultimate Price

Artifacts
2x Hedron Archive

Planeswalkers
2x Liliana, The Last Hope
1x Ob Nixilis Reignited

Land
2x Choked Estuary
4x Evolving Wilds
3x Forest
4x Hissing Quadmire
2x Island
2x Lumbering Falls
3x Sunken Hallow
4x Swamp
2x Llanowar waste

Sideboard
3x Aerial Volley
2x Dead weight
1x Dragonlord Silumgar
1x Ishkana, Grafwidow
2x Pick the Brain
2x Summary Dismissal
1x Kalitas, Traitor of Ghet
2x Transgress the Mind
1x World Breaker

This is what I'm playing. Very different from your deck, but very controlling and so far it's been doing well online. I think the manabase could use some tinkering but i'm lazy The point is to kill, kill, kill everything, and then you absolutely drown them in card advantage with seasons past, a delirium-ed scour the laboratory, or a fortune's favor powered up take inventory. i tried epiphany at the drownyard but it really underperformed.