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You definitely want the four Evolving Wilds, since in addition to making it a lot easier to make the mana work, because they leave the battlefield and replace themselves with a uniquely named land, you dont have to worry about drawing multiples with Field of the Dead, and in fact they can let you double-trigger Field of the Dead in the late-game

Heroic synergizes very well with auras (and flashback spells), and there are auras, enchantment tutoring, enchantment recursion, and enchantment removal aplenty in Ultimate Masters

filledelanuit says

Discover more of the best MTG Dragons in our dedicated guide

And then, when he's battered and worn down, he draws you a card on the way out, replacing himself