i only play standard on mtgo as well, and i didnt mean you should be running Silkwrap mainboard. i meant that most people, including myself, are running it as a permanent way to deal with Hangarback Walker since it gets popped even if they destroy the wrapping of silk. plus side it also gets Managorger Hydra and Mantis Rider and all those other low cmc jerk creatures. but when i mentioned silkwrap, i meant you should be running hangarbacks in this build. if you can afford obviously. personally i dont see any reason to run the kolaghan from FRF. just gimmicky, sorin is a cheaper cmc and gives lifelink to all your creatures, not just dragons etc

Sorin, Solemn Visitor should be definetely in.That lifelink can save your day and his ultimate -6 is almost gg in this deck.

I'm iffy on removing Storm's Fury with the success I've had with it thus far, but I'm willing to make basically any and all changes for the sake of experimentation.

I do have 2 Hangarbacks and had run it in here before, but it/its tokens consistently died to the sweepers I'm running.

Sorin is already in as a 2 of.

I don't know what your land preferences are, but could you afford to add a one-of Blighted Fen?

I'll put one in place of a Haven. I shorted myself 2 dragons, so it should equal out nicely.

I don't think you'll have too many problems adding blue as it does allow for some great cards. Instead of spell shrivel, I might add something more aggressive such as mantis rider, as it is a very good creature right now. Too me it seems your curve is a bit high and maybe having a couple 2-drops would do you good. Dispel is a good card, but i would only play a max of 2 mainboard because of mana issues and i would have a blue land in your sideboard if you choose to board out other colored cards for blue ones. Dig through time is always amazing. Hopefully this helps you, good luck!

I personally have added blue to make Tasigur, the Golden Fang a serious threat and of course Treasure Cruise

Okay some of the changes I think you should make are:

Remove 1 Nomad Outpost for another Bloodstained Mire, since it grabs two of your colors it's just too valuable to not have 4 of plus Outpost is naturally slower. Take out another Nomad Outpost and a Mountain for 2 more Battlefield Forge. Also, take out a Plains and a Swamp to put in two Caves of Koilos.

I think these will make you mana base a lot smoother.

And in this deck, always have more Despise than Duress. You are relying on Planeswalkers here and they are very vulnerable to any creature that drops.

Also a good sideboard card forever : Infinite Obliteration.

I might agree to the manabase adjustment, but that's a very hurtful manabase.

5 fetches, 5 painlands. Yikes. Sorin is good, but he doesn't always show up!

I have more Duress vs. Despise to help offset the large amount of removal present in the deck. I currently have 15 cards in the deck that can potentially kill 1 or more creatures on the field. Despise is mostly for other walkers and indestructibles as that's been my biggest struggle (curse you, Ugin and Ulamog!).

Infinite Obliteration is definitely a card. That could be my answer to Ulamog, but I'm unsure as to what I could replace. Maybe the 1-of Ruinous in the side? Dunno.

27 lands and no fetches... Nope, you're just going to draw lands in late game

There's very clearly 3 Bloodstained Mire and 1 Windswept Heath.

still too few, i run 25 lands and have 10 fetches and still get flooded

I'm sorry Scrooge McDuck, but have you ever considered people may struggle to pay for fetches?