Either way, it takes 6 mana to get out.
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I think this needs more lands. Hitting land drops is important if you want to get Shadowborn Demon and Nemesis of Mortals out.
Instead of flesh//blood, use fall of the hammer. 1R at instant speed for the same effect.
I'd really appreciate advise on my GW Heroic deck! http://www.mtgvault.com/hipsterpumpkin/decks/selesnya-heroic/
I'd run both, since titan's strength is really good. Sure, it's only one trigger, but its a really solid spell. Not to mention the scry.
I'd say more creatures in general. It's hard to pull off a lot of heroic triggers with so few creatures.
A Bow of Nylea or Nylea herself might go good in here too.
I'd much rather have a main deck Polukranos than a flame-wreathed phoenix. I find the Monstrosity ability is much more useful than a 3/3 or 6/6 flyer. Might just be me.