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Isochron with some more fog like thangs and maybe consider cards like mana reflection to make crazy hydras... My friend and I have been trying desperately to make a gruul hydra deck work... it never comes to anything more than a beastly multiplayer deck.. best of luck to you
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aspect of hydra?
Strength of the Tajuru, Overwhelming Stampede, Doubling Season, Death's Presence, Rogue's Passage, Gilder Bairn and Clockwork Hydra are some ideas.
And maybe rancor.
maybe use explore instead of harmonize and add 2 more lands.
How about using Door of Destinites?
I'd replace two Naturalize and one Harmonize with 3 Khalni Hydra.
check out my Standard hydra deck with infinite abilities. http://www.mtgvault.com/lordrodrigo85/decks/hydra-ramp/