Played investigation in draft, wasn't too bad, want to play more of it :)

Strategy

The win condition is to use Briarbridge Patrol and Tamiyo's Journal to put a big creature into play and hit hard the next turn. Currently I have Kozilek, the Great Distortion to finish the game with, but it might be good to get one or two others in there, in case they get exiled or similar. I could image Plated Crusher or Bane of Bala Ged , since they seem to be strong and cheap to aquire.

My cheap creatures help me to get more clues, Graf Mole has good stats and gives additional benefits to sacrificing clues. Since the deck isn't too fast, we need a way to deal with the enemy, for which we have Compelling Deterrence and Containment Membrane . Confront the Unknown is a great combat trick that is cheap and should be very strong in this deck, helping to actually give us a bit of a defense.

Many of the cards are based on what I have or believe to be able to get without spending too much money. That's why two Kozilek, the Great Distortion and Altered Ego are included.

What I'm unsure about:

Things like Erdwal Illuminator and Graf Mole go without thinking, but some of the other stuff is still a bit fuzzy.