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Enchant creature with another Aura attached to it
Enchanted creature gets +3/+3 and has first strike, vigilance, and lifelink. (Whenever it deals damage, its controller gains that much life.)
In duel commander, Zur is banned as commander though. I'll give some suggestions with the mindset that this isn't following the duel commander rules.
So here are some good options for a zur: Diplomatic Immunity , Necropotence , Solitary Confinement , Energy Field in combintation with Rest in Peace and/or Web of Inertia , Phyrexian Arena , Oubliette , Runed Halo , Vanishing , Rhystic Study , Mystic Remora , Aura of Silence , Daybreak Coronet , Replenish , Winds of Rath
Cards that are overall amazing cards: Demonic Tutor , Vampiric Tutor , Idyllic Tutor , Venser, Shaper Savant , Cyclonic Rift , Mana Crypt , Sol Ring , Teferi, Mage of Zhalfir , Trinket Mage , Sensei's Divining Top (especially with a bunch of shuffling effects like your commander), Aven Mindcensor , Notion Thief , Consecrated Sphinx , Phyrexian Metamorph , Command Tower , Arcane Sanctum , Watery Grave , Hallowed Fountain , Godless Shrine , Vivid Creek , Vivid Meadow , Vivid Marsh , Reflecting Pool , Strip Mine , Wasteland , Ghost Quarter , Reliquary Tower , Volrath's Stronghold , Academy Rector , High Market , Gilded Drake
Underworld Dreams , Engineered Plague and Telepathy don't really belong in this list I feel. Also, Engineered Plague doesn't really do anything in commander unless you're designing this deck to troll a specific opponent. Then, the circles of protection are cute, but they take up 5 entire slots... drawing them when you're not facing the right color is awful. Story Circle is a bit more color intensive, but you're playing commander, so you can afford to get hit a few times. Also, Maze of Ith , Kor Haven and even Mystifying Maze are viable options.
Daybreak Coronet would be insane here.
look at reid dukes deck. he takes out all of your creatures except for kor spirit dancer and gladecover scout, takes out oppressive rays, alpha authourity, concentrated effort, one land and rebuff the wicked to add in 4 Slippery Bogle , 4 Daybreak Coronet , 4 Hyena Umbra , 4 Keen Sense , 4 Spider Umbra and 3 Unflinching Courage
26 lands is way too many, 20 is much closer to where you want to be. Also, if you're already jamming expensive lands like Horizon Canopy you really need to get the rest of a mana up to snuff. Nearly every card is a colored mana symbol, which means the deck sometimes wants to curve T1 Slippery Bogle into T2 Rancor + Keen Sense into T3 Daybreak Coronet while on only 2 lands. That means nearly every land needs to produce GW. Razorverge Thicket , Temple Garden , Brushland , etc.
Dryad Arbor is really only effective with fetchlands. The only reason the bogle lists play it is because you can fetch in response something like Liliana of the Veil -2 or in desperation you can fetch Dryad Arbor end of turn and suit it up while someone is tapped out.
Ethereal Armor is one of the most powerful cards in the deck, it's the only route to a T3 win and is usually what puts the deck on a solid Turn 4. This should absolutely be a 4-of.
Hyena Umbra a lot of the time it's better to have Spider Umbra first. There's already a lot of redunent first strike from Daybreak Coronet and Ethereal Armor . Generally you're running a mix of both though.
I'm not a huge fan of Eidolon of Countless Battles here. As a creature it's big, but it's not going to be bigger than a suited Kor Spiritdancer and it doesn't come with nearly the same upside for an unprotected creature in the deck. As an aura it looks even worse, it's a Ethereal Armor that's 4 times as expensive. It gives you a little wrath protection, but I'd rather just run more umbras.
Some additional cards to consider. Spirit Link can be very strong since it doubles up on lifelink essentially. Unflinching Courage boosts power, gives evasion and lifelink. It's a little on the expensive side for the deck but 2-3 usually make the deck. Spirit Mantle can be very useful as another source of evasion. Sometimes bogles can loose to the ground just getting clogged up with chump blocks. Suppression Field is sometimes a great mainboard hate card. It stops, or slows down, a number of problematic cards long enough for you to run them over with a big suited creature.
Daybreak Coronet is really cool, but far too expensive for my budget, plus my friends would hate me for playing it.