Denial-control
Pretty standard denial-control. The key to palying the deck right is knowing your matchup. You should be trying to get ahold of Thoughtseize or Thought Erasure, and Unmoored Ego to a lesser degree (And the lands to play it, of course). Once you know your matchup, you can decide how critical having these is for games 2 and 3, but Unmoored Ego is virtually useless without that information. Garnering such information will also allow you to better select your counterspell and removal targets,
Sideboarding
Planeswalker- or creature-dependent matchups will want all four Hero's Downfall in the board immediately.
Inquisition of Kozilek and Mana Leak both want to be included in aggressive matchups. In these matchups, you can remove Glacial Fortress entirely, as you'll be less dependent on your White fixing in general.
Notion Rain works will with other control matchups, letting you keep answers in-hand in a matchup that puts less pressure on your life total.
Maybe-board Discussion
Meddling mage is an effective addition to the board, keeping a creature on the field to draw out removal and put pressure on cards you didn't get rid of via Unmoored Ego, Thoughtseize, or Thought Erasure. Being the onyl creature being run in the deck makes it an easy target, however. A more creature-heavy version of the deck (Note to self, draw that up) could run it with Brain Maggot in place of Thoughtseize, and Snapcaster Mage over Mission Briefing to similar effect.
Strictly speaking, any of the mentioned cards could serve as a wincon, but deciding which to use has been difficult.
-Jace, Memory Adept puts a massive strain on the opponent's deck. Combined with Unmoored Ego, it makes recovery very difficult. His ult is also the most direct win, and all threee abilities are useful.
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Sorin, Lord of Innistrad has the flexibility of providing lifegain, as well as either offensive or defensive board pressure, and has the highest impact against other control decks. However, Sorin puts emphasis on the board in a deck that otherwise ignores it, making his second ability negligible.
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Lone Revenant is the most direct wincon. It resists removal, filters and draws cards, and can deal steady damage. It is, however, still vulnerable to board wipes and can still be hit by damage-based ones with only 4 toughness. At 5 CMC, it still fits aggressively into curve as well.
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Silumgar, the Drifting Death is evasive, nigh-impossible to remove without a board-wipe, and kills weaker creatures when it swings. The clock is slow, but this deck can handle that.
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Sphinx of the Final Word is an irrefutable wincon. Evasive, more resistant to damage than Lone Revenant, and the fastest clock. Nothing flashy, but effective.
