Hey all,
I'm going to play in a tournament this week. I still dont know what to play for it.
The metagame will be: Ichorid, Flash, 9Sphere decks and some random aggros.
Wich deck will best suit this metagame? I'm thinking about Oath...
Thanks for any help!

Actually Goblines sounds good for that metagame. Run versions with Leyline of the Void in the main and be sure to have Shattering Spree, Red Elemental Blast and Pyroblast post board.
Goblines does well against Ichorid since you have maindeck Leyline of the Void. Also the Strip and Waste can help.
Leyline helps you against Flash in game 1 and then you have REBs and Pyroblasts post board. Flash is further bothered by Mogg Fanatic and chump blocker.
Stax absolutely hates playing against Goblins in general.
Finally Goblines generally does well against Random Agrro.
Good luck!