VintageFTW

I like Accumulated Knowledge. On the second time around, it's already super-powerful. Also, I prefer Spire Golem to Errant Ephemeron. If not Spire Golem, you could play Lonely Sandbar over Evolving Wilds.

In Blue/White, Wall of Denial is strictly better than Hover Barrier. Also, Fabricate can help you find Panoptic Mirror or Granite Shard. Broodstar doesn't seem to be doing much in this deck, I would take it out. Ugin's Nexus or Stranglehold don't deal you damage, so you don't need Gideon's Intervention, you could just use Meddling Mage, Nevermore, or Declaration of Nought, which are all cheaper. Calciform Pools is strictly better than Mage-Ring Network. For ramp, you may prefer Azorius Signet, Cluestone, or Keyrune instead of your creatures, but maybe not. All in all, a neat concept for a deck. I like it!

Runes of the Deus and Scourge of the Nobilis are also both super-good with Uril.

Eu não sabia que tinha portuegueses neste site! Bakana, mano.

Black Vise goes along great with this deck.

Um, you put in Sea Gate Wreckage with no Colorless sources. Whoops. Aether Hub, Blighted Cataract, and Geier Reach Sanitarium are all viable to give you colorless mana.

Rakdos Charm, Batwing Brume, Night of Soul's Betrayal, Illness in the Ranks, Curse of Death's Hold, Aether Flash, Virulent Plague, Elesh Norn, or any spell at all that kills enchantments.

Other cards that set up Tunnel Vision: Cards with clash, Aetherspouts, Hallowed Burial, Hide/Seek, Hinder, Junktroller, Mesmeric Sliver, Natural Obsolescence, Not Forgotten, Reito Lantern, Spin Into Myth, Terminus, Vessel of the Endless Rest. The problem with Tunel Vision is that the opponent usually has multiples of all of his cards.

Maybe you're new to this kind of thing, but you need lands to cast your spells. Each card has a cost in the top right corner that indicates how many land you have to 'tap' (which shows they've been used for the turn) that yield mana, which you use to cast your spells. If I were you, I'd take out 20-22 of your weakest Merfolk, and put in that many Island cards.

There are several good Bird Tribal cards: Seaside Haven, Ageless Sentinels, Airborne Aid, Battle Screech, Jotun Owl Keeper, and Keeper of the Nine Gales are the most powerful, I'd say.

It was common in Vintage Masters. I'm not sure if that counts, because it's MTGO, right?

Would you guys stop gushing over Storm Crow? It's really not funny. If the joke is that it's a bad card, Sea Eagle is strictly worse. There are so many obviously strictly better cards: Aether Swooper, Erdwal Illuminator, Glint-Nest Crane, Illusionary Informant, Metropolis Sprite, Mist Intruder, Screeching Silclaw, Seacoast Drake, Tempest Owl, Thalakos Sentry, Wu Light Cavalry, and Carnivorous Death-Parrot. It's really a nonsensical joke. If the humor is that the whole idea is absurd, that has definitely worn off in the past years.

Maybe Painful Truths?

Umm, He enters the battlefield, so you don't have priority, so the person still gets the emblem. Or are you insinuating that you're swinging for lethal on the same turn?

Hey, I really like Accumulated Knowledge. Anyway, nice deck!

Swiftfoot Boots?

Mask of Avacyn seems like an odd choice to me. I would use something like Bonespitter. You could attack with a 3/1 double strike on turn 2. Or maybe Bone Saw or Golem-Skin Gauntlets or Shuko or Trusty Machete.

You need to find a way to untap the Cauldron, because the creature that died and the creature that returns are considered different objects, and no longer have Persist.

Paradox Haze?

I get the feeling the Cipher cards would be very powerful here.