Phyrexian Portal {3}
Artifact
{3}: If your library has ten or more cards in it, target opponent looks at the top ten cards of your library and separates them into two face-down piles. Exile one of those piles. Search the other pile for a card, put it into your hand, then shuffle the rest of that pile into your library.

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MUD decks have been playing Kuldotha Forgemaster with a suite of silver bullets like Spine Of Ish Sah, Blightsteel Colossus, and Sundering Titan - this strategy makes Phyrexian Portal unplayable since you would be exiling your Forgemaster bullets.

Traxos was just recently printed, and seems like a good replacement for Forgemaster, along with Wurmcoil Engine, Steel Hellkite, Lodestone Golem, we're approaching a new MUD archetype. In this more straightforward aggro shell, could Phyrexian Portal find a home?

The best way for your opponent to split the cards is 50/50, each pile's quality relatively even. The player who controls Phyrexian Portal is ultimately the one choosing the pile, so you have a 50/50 chance of getting the best of the 10 cards. I think the card selection power is kind of insane. The biggest drawback is paying 3 mana to activate. However with Cloudposts mana in the deck maybe this isn't so terrible in the later game.