Eldrazi Ramp help, Green/White

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Hello everyone. Relatively new player on a semi-budgeted attempt at building an Eldrazi ramp deck. It's done alright in the casual circle, but it has a huge weakness to burn decks, especially friend's goblin deck. I want to attend a tournament in Columbus in July, and I was wondering what advice you could offer me?

It used to be mono-green. I decided to turn it into a dual green/white deck and change this around. This is what it looks like now:


As you can see by the changelog, I removed a lot of the lesser eldrazi. I've been advised to add Karn and Wurmcoil, but I'm afraid of how I would be able to ensure getting Karn out.

Does anyone have advice?

Thank you