Haven of the Spirit Dragon
is probably one of the best land cards in any dragon deck. Let's me resurrect dead or discarded dragons in the late game.
Nykthos, Shrine to Nyx is an amazing land that can generate enough to cast anything, including Geosurge even when I couln't gather the on my own.
Slumbering Dragon is a good first-turn-drop as it punishes early aggro.
Dragon Tempest for early burn and haste.
Dragonlord's Servant to cast dragons earlier, has a decent body with 3 toughness.
Taurean Mauler is a really good card against spell spamming decks. At worst, it slows down the opponent. It can easily become a threat on its own.
Dragon Egg This can virtually trigger Dragon Tempest twice. Mainly here for its token's fire breathing ability as well as being a free blocker.
Avaricious Dragon is an awesome card advantage with an efficient body, but you have to be careful about the timing. He can turn your game around.
Thunderbreak Regent is super punishing for touching your dragons and opponents will have to think twice about doing so. At worst, this is a cost-efficient 4/4 beater with a free Lightning Bolt if removed.
Scourge of Valkas is the bread and butter of this deck, I always try to get him as fast out as possible. If I have him on my opening hand or draw him within turn 3, I tend to play Dragonlord's Servant in fervor of Dragon Tempest.
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Moonveil Dragon
is a hell of a dragon in general. with his global fire breathing, he has the ability to end games.
That is basically it. Bring Dragons out and profit.