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If you're going to combo Hydra and Corpsejack, why not add 4 Sheltering Word? It's insanely good. You can take out Ranger's Guile for it, easily. It has the Hexproof effect anyway, and you don't need the +1/+1 that badly since it isn't a counter.
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good idea
I want to say you should add in some resurrection, like Disentomb, just in case your Hydra gets Cancel'd or Murder'd, but I don't exactly know what you should take out for it. The highest cost in your deck is 4, but you have 23 lands. Maybe you could do 20 lands and add 3 Disentomb?