yeah! like that.

Have you considered using a Proteus Staff to convert one of your Blinkmoths (or Inkmoths) into Blightsteel or Emrakul?

If I put a Proteus Staff in, then there's a chance that Shape Anew will hit it, wasting a spell, a turn, and often the game.

If I used it, I would have to replace the 4x Shape Anew with 4x of it, and remove the 2x Blightsteel Colossus for 2x Emrakul, the Aeons Torn .

It might work, but that would also mean that you would have to spend an extra turn activating it... If it did not have "Play this ability only any time you could play a sorcery", it might be worth it.

You need some way of giving haste to your creatures like lightning greaves but that doesn't work well with shape. I would run the one mana counter that only counters if it is targeting your creatures in the side if they have ways of exiling blightsteel

I'm now debating.... Thirst for Knowledge or See Beyond. - The general concept for the spot is to get card advantage while I shuffle Blightsteel Colossus and/or Emrakul, the Aeons Torn back into the Library... since they both shuffle themselves back into the Library if discarded it becomes a hard choice.

Thirst = Digs deeper, and Instant... but will often have to discard 2... + 1CMC more.

See = Cheaper and no discard... but only digs 2 deep, and at Sorcery speed.

Either way... See is competing in the curve with Remand and Mana Leak... Thirst is competing in the curve with Master's Call (important for the T4 Poly/Shape).

@Rayenous: Thirst for Knowledge would likely be a better card. You'd be able to hold up mana for your Remands and Mana Leaks instead of tapping out for See Beyond. Then, since Thirst for Knowledge is an instant, you can leave your mana up on turn three for either it or Master's Call, and wouldn't have to choose till the end of your opponent's turn. If you have Call and the turn four Poly/Shape, you can take that route, or if you're missing a piece, you can dig for it with Thirst.

how about Chalice of the Void? You could replace your 4x Spell Pierce with 4x Chalice of the Void and you can always cast it with X=1 without drawback. To shut down one drops is pretty good as most of the U/R delver deck is one drops. I justify mainboarding because it also stops Lightning Bolt and Path to Exile and other one drop removal that messes with your poly targets.

Unfortunately, I can't use Chalice of the Void. Artifacts (as well as creatures) have to be limited to things I want Shape Anew and Polymorph to bring into play.

I have thought about the possibility of side boarding into -2 Blightsteel Colossus and +2 Worldspine Wurm... thus opening up the 4x Shape Anew slots... that would allow for Artifacts... but it would also reduce the win-cons to 4x Polymorph.

It may be okay against some deck types... but likely not worth so many sideboard slots.

Maybe a singleton Tolaria West to search out a Blinkmoth land in an emergency. Also, why is Thirst for Knowledge in here when Blightsteel Colossus is your only artifact card? Blinkmoth lands only can be artifacts on the battlefield when the activation cost is paid. 2x Serum Visions might be better than Thirst for Knowledge, your 3 CMC spot is super heavy. Serum Visions will let you use your first couple of turns to help sort through your deck to your combo pieces. I would say -2 Spell Pierce, +2 Spell Snare. Pierce becomes less viable the longer the game goes on, Snare will continue to be a hard counter for the most commonly used CMC spot throughout the whole game. That's really all I can see to change. This looks like a fun deck!

Thirst for Knowledge is extremely important and much better in a combo deck than Serum Visions.

It lets me dig 3 deep... it's instant speed, so I can keep mana open for Mana Leak or Remand if needed... it allows me to discard 1 or 2 Blightsteel Colossus or Emrakul, the Aeons Torn if I have them in hand (thus shuffling back into the deck, where I need them)

Telling Time is another option digging 3, for 2 mana. It doesnt let you shuffle cards back from your hand, but you can put fatties on the bottom if you hit one.

Telling Time doesn't let you put Emrakul, the Aeons Torn or Blightsteel Colossus back into your your Library if they are already in your hand.

Just removed 2x Dig Through Time. - Added 2x Faith's Shield as my weakest point in the deck is that Polymorph fizzles if they have instant speed removal.

It will also help against a common outcome, where I get my combo, but they kill me before I get to attack because I'm already too low on life. - Faith's Shield acts as a fog and will let met get in the winning attack.