Deceiver of Form: a colorless Battle Cruiser Rite of Replication on a creature (2UU, Kicker
Endbringer: great effects in Battle Cruiser Standard, a junk rare in Modern. "Draw a card
is excellent.
Kozilek, the Great Distortion: good to try in Modern Tron, yet compare with the previous Kozilek: 10 generic mana 12/12 "When you cast Kozilek, Butcher of Truth, draw four cards. Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.) When Kozilek is put into a graveyard from anywhere, its owner shuffles his or her graveyard into his or her library."
Eldrazi Mimic: this is one of my favorite cards of this set, full of Johnny deck-building possibilities. You have to cast the creature it copies, and that is a limitation. Still, its like a token with Haste of whatever colorless creature you just cast.
Kozilek's Pathfinder: very good in limited, where you are likely to be facing a smaller number of creatures.
Reality Smasher: seems very good. Its not Hexproof, or Indestructible, but you can at least cause opponent to discard to remove or enchant it.
Matter Reshaper: similar to Collected Company, now on a creature. Seems very good. As a 3-drop you can use this effect mid-game in Modern.
Spatial Contortion: don't miss the -3, its not +3/+3, its +3/-3. Useful as removal and as a boost to one of your big creatures, or a smaller creature with a fat butt.
Thought-Knot Seer: a Vendilion Clique variant (1UU; Flash Flying "When Vendilion Clique enters the battlefield, look at target player's hand. You may choose a nonland card from it. If you do, that player reveals the chosen card, puts it on the bottom of his or her library, then draws a card."). Should be very good in Standard, but in Modern Vendilion Clique 3/1 is much better and already rarely used as more than a 1-of. Flash and Flying are really important. The most important plays for this type of card are all about the surprise of Flash as a response any time during the turn, and as a bonus you can attack with Flying. Yet as I think more about this card, I want to try it in Modern anyways.
Walker of the Wastes: great Johnny card, must play. In a Wastes-focused deck this thing is a hit, and its an uncommon. Love it! Sure, it will get removed a lot, but with four in the deck at least one should go through.
Warden of Geometries: needed for limited Wastes casts.
Warping Wail: seems good to very good. It can be a momentum kill, can drop a token, or counter a sorcery. This is a very solid uncommon.