darkwulfv

That's also why there's the giant monsters at the top of the mana curve. If they spend their removal trying to stop you from getting the Elite Arcanist working, it'll clear the way for things like Utvara.

The Axebane Guardians can definitely push out one of the 3 huge creatures rather quickly, while your walls hold things in place. It's possible that a very early aggro push could do some serious damage but if you can get up 2 or 3 walls you can probably keep yourself alive long enough to drop one of the monsters.

Since it's a defender deck with its win-condition at the high end, I don't think the mana curve is going to be a problem. If this were an aggro/fast deck that wants to drop something every single turn I could see more cause for concern, but once that Hover Barrier lands, it's going to stop just about anything they can throw at you and is almost impossible to burn without wasting a damn good card.

You could theoretically drop the Angelic Walls for Hover Barriers (I know it's 1cmc higher, but it's a 0/6 flier) and this would allow you to basically remove the Plains from the deck (since you'll want to be casting Silence through the Elite Arcanist, which is colorless) and solidify the manabase a little. You could use gates for the white mana in the event you need to hard cast Silence.

Curse of Exhaustion could be a good backup, since if you're playing against control they only get 1 spell per turn, in case your Silence gets countered or the mage dies. It also keeps you from banking too heavily on a single creature with a single spell.

Love the concept, though I'm afraid of what could happen if they happen to burn out your Axebane Guardian and you're holding Niv/Utvara. Maybe some Gates with Red in them could be useful, to be fetched with Gatecreeper

Argentum Armor is a great removal (and equipment) too.

I personally find Jareth to be worth the heavy cost. He's such a tank. But I can understand wanting to keep the space open, Raksha already costs 7.

If you have him or can get him, Jareth, Leonine Titan. Seriously.
4/7 with +7/+7 when he blocks, and protection from any color for just W.
Raksha makes him an unbeatable, unkillable blocker.
Did I mention he's essentially unblockable by anything but artifacts? (due to the pro-any color you want, whenever you want).

I'm also assuming you know this, but the shroud from Lightning Greaves stops further equipping. Not hard to fix (just move the greaves and move them back), but it's a minor annoyance.

Hunted Horror gives 7 +1/+1 counters for BB, which is the most cost-effective boost besides Death's Shadow. I get that the two 3/3 pro-black centaurs seem counter-intuitive, but he makes for good fodder, and if you're hitting with any of the tramplers it won't matter. A 3/3 isn't going to stop a 40/40 Lotleth troll. He himself has trample, so if you put him out and boost him to huge levels, those centaurs aren't going to stop you.

Modular seems interesting, but because they usually start as 0/0 they are useless for Scavenge. I'd prefer if every creature in the deck could be scavenged. Plus modular only works between artifacts, so I'd need additional artifact creatures, and Phyrexian Soulgorger doesn't really work for much more than scavenge.

Just noticed you have 2 Phyrexian Portals in there.

The way you explain Mycosynth Golem leads me to retract my statement; keep him in there, I didn't realize he would make casting Karn cheaper or free. That's an excellent point.

It does look like a fun deck, of course. It looks like an interesting concept to play with and against.

While I love Belbe's Portal for tribal decks, this is not one of those. You're better off using Quicksilver Amulet.

Mycosinth Golem is also a little less useful here due to how few creatures you have, and how much mana you can already produce to power out the big creatures you have.

And if you decide that pure colorless is a little rough, try Bosh, Iron Golem as your commander. It'll give you access to red, which opens up a lot of possibilities.

I don't know if you're looking to keep this limited to certain sets/formats, but Mana Tithe and Orim's Chant could be really good additions. Orim's Chant could replace Silence, since it does the same thing for the same price but comes with the added bonus of stopping attackers for the turn for one additional W. Overall, though, it looks really good!

Mana Leak and Cancel are pretty much the best basic counters other than "Counterspell", so that should work fine. You could always look on Gatherer for other counters in U/W and see if any do anything special that you like.

And that's a good point with Silence. I'm not sure what you could cut to make room for any additional spells, though.

Due to Guile's high mana cost you'd probably only want maybe 2 of them in the deck, but once they hit the field it's probably game.

If you decide to add Guile, I'd suggest adding some more counterspells for Guile to feed off of, likely replacing either Ghostly Prison or Silence. Curse of Exhaustion + any counter spell is a powerful soft-lock out of the game. Although if you have Curse and Guile on the field, your opponent will probably just quit right then.

And if you feel the need for some more defense, Wall of Denial is pretty much the best you can get.

Would be fun to play, awful to play against. If you really want to annoy the other person, put Guile in there, so that when you counter the only spell they play, you steal it. He's also a 6/6 anyways, which can help be a win-con.

Render SIlent and Curse of Exhaustion are also kind of redundant with each other. The first stops them from playing any more spells, the other limits them to only one anyways, so if you counter it they don't get to play another anyways. Both are still annoying as all hell to face though.

If you wanted to splash Green, Gaddock Teeg would make things even more restrictive for them.

It's green/white aggro. The token generators (Armada Wurm, Advent of the Wurm, and Voice of Resurgance) just happen to be very cost-efficient and rather powerful green/white cards.

I played an EDH deck with Mayael as the commander. My biggest suggestion is to get rid of all the non 5-power-or-greater creatures. When Mayael is on the board, you want to always find a fattie. Unless the EDH games you play go extremely fast, the creature rampers aren't necessary either. Each of those small creatures could be something huge and terrifying. Maybe the only exception would be Drumhunter, due to the card draw, and Elvish Piper, so you can cheat things into play quickly.

Mayael's Aria is neat in theory, but I never had it last more than a turn (my creatures often didn't either). It's an interesting win-con, but chances are you won't be able to get it to win you the game. There's better creatures/enchantments to use.

I also highly suggest Mage Slayer, Hedron Matrix, and Kusari-Gama. Mage Slayer lets you hit them directly just by attacking, Hedron Matrix makes your scary guys (26/26 Worldspine worm!) even scarier, and Kusari-Gama can lead to entire field wipes if you hit with big guys, and it gives colorless firebreathing.

Ascetisism is also amazingly powerful here. Your creatures are going to be the target of all sorts of hate, and giving them hexproof and cheap regen is critical. On that note, creature recursion is important. Reya Dawnbringer is a great creature for that, though she's only a 4/6. Marshall's Anthem can be an amazing spell to play too, since you'll have lots of land to kick with.

When I played this deck, it was mostly Beasts, Wurms, Angels, and Dragons. I loved the deck to death (Naya is my favorite 3-color), but unfortunately my group was very focused on field wipes and creature hate, so I usually died first because they knew how quickly the deck can snowball. Hope the tips help.