*Guide in Build*
This Build isnt viable in any ranked games because it lacks defensive items.
Im not a pro, just wanted to post how do i play normal games.

Pros:
-Awesome Scouting
-Warp gates for players with Teleport
-Great Harassment
-Good Farmer
-Speed of Light
Cons:
-Squishy
-Easly Gankable
-Easly CC'able

My Fav's:
Ghost - It helps in running away from ganks. And i just like it.
Exhaust - All time my favorite summoner spell, helps in a 1v1, helps to run away from ganks (e.g. If surrounded run thru a melee and try to bypass him with "W" + Exhaust on him)

Other possibilities:
Teleport - With your shrooms all around the world helps you assemble a gank or lets you backdoor.
Flash - Great replacement for Ghost, probably its even better.
Cleanse - Counter for CC's if u feel over cc'd :]

Stay away from:
Ignite - You got already a powerful dot and hextech to counter heals.
Revive - Lol'wut?
Fortify - W/o stun or taunt its senceless to use it imo.
Heal - Heal is only good for early game, and instead of taking it you got regrowth pendant which allows you to stealth and wait for HP.
Clarity - You've got Philosopher's Stone and Nashor's Tooth for mana regen.
Claivorance - One word: Shrooms.
Smite - You're not jungling.

This map shows basic placements for shrooms as long as your team fights around that place.
(I mean dont make shrooms around ur nexus if ur team is about to win)
*Map in Build*
Also there are some factors that should make you place additional "special shrooms".
* If there is a jungler on enemy team and youre on lane next to blue buff its good idea to mushroom the grass near the BBuff Golem so you know when the jungler comes so you can easly gank him with ur teammate.
* Also if there is a jungler on enemy team is good idea to shroom dragon early and gank him (See above)