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i think the best way to round off this deck would be with three cards. you don't have to run them all, but they should do what you want to round the deck out.
Yavimaya Elder -this guy gets you two lands to hand AND can draw you a card, all for 3 mana. added bonus, fit's the elf subtheme.
Harmonize = this can easily fill in the gap between your starting hand and titans, or titans and eldrazi.
hope this helps to get the most ramp out of your deck!