i'd suggest gisela, blade of goldnight, as she doubles your damage dealt :) also, sheoldred, whispering one/reya dawnbringer are very effective in your deck, revive them first and they'll revive for you. Moldgraf Monstrosity can work, too
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i'd suggest elvish spirit guide and/or chrome mox
i'd suggest to add one or two "oran-rief, the vastwood", as it works well with the kalonian hydra. there are a bit too many enlightened tutors in the deck, and asceticism doesn't really make sense;maybe put it in sideboard. considering your low-mana defenders and your craterhoof's ability, which bases off large numbers of creatures, neither do i think day of judgement should be here.hope this helps! :)