That is a very powerful deck. Very expensive too. Death's Presence sounds good, but card advantage and political play is a decent idea. You have enough cards that can break +1/+1 counters, you don't need another.
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I'll try to comment like the description. In the interest of the deck builder, I would gladly like to give some advice. First, since your strategy is made to be slow, perhaps adding 1-2 Angel of Serenity will be good. They're really big, but if you play them, you will control a lot of the battlefield. The second order of business would be to play 1-2 Jace, Architect of Thought. His + ability was almost made for this kind of strategy. I am pleased to await your response.
Ha! Drakes! Awesome stuff here. I'd probably take out Wild Guess for Divination and Fleeting Distraction for something like Galvanic Blast
You have a bunch of decent EDH support, but here's a bunch of things that don't look like they'd be good: Arcbound Wanderer Lunar Avenger Darksteel Pendant Wanderer's Twig None of these spells should be played in EDH. I can see you've got some Proliferate, but is that just for Sunburst? Sunburst as a mechanic, is pretty poor in terms of game mechanics go. It's exceptionally conditional, and the end result is usually underwhelming. I'm now questioning the Engineered Explosives and how you'd play it. Case and point: Arcbound Wanderer and Lunar Avenger. The most is can be is a 5/5, but that'd mean that you couldn't play any other spells during that turn that have sunburst, unless it's turn 10, where you'll have 10+ lands on the field, hopefully getting changed by Prismatic Omen and Joiner Adept. Why not play a Hydra-style card like Protean Hydra, or, since you're going into multiple colours, why not Phytohydra? You'll have some giant creature out that doesn't need 5 colours to be tapped for it. You'd be happier with those than the Sunburst spells. Pentad Prism, however, is a keeper, no matter what. Darksteel Pendant should probably be replaced with Crystal Ball, since it's pretty much better, and won't be useless when you have Darksteel Forge out. Wanderer's Twig is absolutely curious, though. Why? There are hundreds of better artifacts than it. Just getting 1 land into your hand is very inefficient for 1 card. You may as well have a land in that slot. Now, the last piece of criticism I'm going to say is this: Make this more about getting lots of mana that lots of artifacts and proliferating. If you want to play the Bringer's and/or Progenitus (I'd suggest Sliver Queen instead), you need mana. If you don't have it, you won't win. Cultivate, Explosive Vegetation, Primeval Titan and other ramp cards are suggested. Also add Manalith, Coalition Relic, Alloy Myr, Mycosynth Lattice, Paradise Mantle, Scuttlemutt, Gemstone Array, and/or Chromatic Star. The Guild Signets are highly suggested as well.