Mainboard:
-Ulamog, the Ceaseless Hunger- Um, this is kinda the wincon. Either through damage (2 hits) or mill (3 swings, maybe 2), this card wins the game.
-Shock- Shock is really good for direct damage or for shutting down the CopyCat Combo. Also good for earlygame removal (I'm talking to you, Scrapheap Scrounger).
-Aether Meltdown- This card can turn big threats into little things to deal with, and a pain in the side to Mardu Vehicle players. Also, the leftover energy can fuel an Aether Hub or a Harnessed Lightning.
-Anticipate- Anticipate is a very good dig spell for when you're trying to find a specific card. It takes the one you want, and gets rid of the others, and helps prevent an Ulamog from going into hand.
-Harnessed Lightning- Harnessed Lightning is a very flexible removal spell that can grow big if you have enough energy in store. Leftover energy from a burn can fuel an Aether Hub in case you're down a color.
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Jace's Scrutiny
- This card laughs in the face of the Heart of Kiran, shutting it down to a 0/4 when it attacks. Besides Heart, this card can shut down any decently-sized attackers, and provides the all-essential Clue token.
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Press for Answers
- A good tapdown spell that removes an opponent's threat for one turn. Also a cheap supplier of Clue tokens.
-Disallow- This is a counterspell, but better. It can respond to a Heart of Kiran crew, a Saheeli Rai drop, a Felidar Guardian flicker, a Winding Constrictor double, and many other things. Also good for, well, countering things.
-Indomitable Creativity- The primary outlet for getting an Ulamog, the Ceaseless Hunger onto the battlefield. Included because hardcasting Ulamog would actually make sense.
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Radiant Flames
- A good board wipe that can deal 3 damage to everything your opponent controls. Punishes the crap out of an Aggro deck, and a good sideboard out for control decks.
-Glimmer of Genius- Glimmer is a great "at the end of your turn" dig spell. The energy also fuels a Harnessed Lightning and Aether Hub
Sideboard:
-Dispel: A good 1-mana counter to eliminate any threats from control decks to your Indomitable Creativity.
-Fragmentize: Fragmentize is a great response to Heart of Kiran, and eliminates any kind of tapdown Aura on your Ulamog. Good against artifact-heavy match-ups.
-Release the Gremlins: Once again, another response to artifact-heavy decks and Heart of Kiran. Also creates a bunch of 2/2 Gremlins cheap.
-Negate: Always a good counterspell to any type of direct burn or killspells. Don't be afraid to put these in if your opponent is playing black, as To the Slaughter is always a thing.
-Fevered Visions: Always board in your 3 Fevered Visions during a control matchup. More often than not, your control-oriented opponent will have more than 3 cards in hand anyway, so dealing 2 damage to them at the end of their turn makes for a great punish and alternate wincon. Also, it supplies you with an extra card at the end of your turn, which is always good.
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Radiant Flames
: In a highly aggressive matchup, Radiant Flames tears aggro decks apart. Being able to deal 3 damage to all of their creatures (including flyers) essentially eliminates their board state, leaving only the big ones to fight your Harnessed Lightnings and Shocks.
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Confirm Suspicions
: The only 5-drop in the entire 75, Confirm Suspicions is a relatively expensive counterspell, but supplies you with at least 2 extra Clue tokens to dig for spells at instant-speed.