So looking at the dragon cards released so far, it feels they want one of the classes that plays them to be Priest. However, so far the dragon archetype seems to be lacking linchpins that actually make it work, which makes me suspect some of the class cards (notably Priest, Druid, and Paladin haven't had any cards revealed yet) are dragon related.
Blackwing Technician (2/4 for 3, gains +1/+1 if you're holding a dragon): A 3/5 is going to trade very well with a lot of early game drops, and it has enough health so that the Priest hero power can keep it going.
Hungry Dragon (4, 5/6, summons a 1 mana creature for the enemy): Again, this is a strong value minion with enough damage to trade, and a lot of health so that it can be sustained by the Priest.
Dragonkin Sorcerer (4 mana, 3/5, gains +1/+1 per spell cast on it by the player): So the obvious buffs that go on to this card would be Power Word: Shield (making it a 4/8) or Velen's Chosen (making it a 6/10 with +1 spell damage).
It's also at least feasible to consider running Azure Drake and Twilight Drake in your hand, especially if you're using a lot of your mana to heal minions on the board instead of playing more cards.
Egg is the one that doesn't seem to fit especially well. Velen's Chosen would at least let it generate a lot of whelps, but that's 4 mana between the two, and one of the only cards that actually buffs the thing to usefulness. Even if we assume you're running two Defenders of Argus due to all the tanky minions, you're still likely to end up in situations where you only get one whelp out of it, not making it worthwhile.
However, I don't feel this is enough to actually make a deck work. While you have some good early value trading, you ultimately either need combos to make even that work, or you're betting a lot of healing mana on one minion that could get removed. You also have a large void getting to the 9 cost dragons, which generally aren't extremely strong game winners. The deck is essentially way too fair to actually get played in constructed only using what's revealed so far.
Blackwing Technician (2/4 for 3, gains +1/+1 if you're holding a dragon): A 3/5 is going to trade very well with a lot of early game drops, and it has enough health so that the Priest hero power can keep it going.
Hungry Dragon (4, 5/6, summons a 1 mana creature for the enemy): Again, this is a strong value minion with enough damage to trade, and a lot of health so that it can be sustained by the Priest.
Dragonkin Sorcerer (4 mana, 3/5, gains +1/+1 per spell cast on it by the player): So the obvious buffs that go on to this card would be Power Word: Shield (making it a 4/8) or Velen's Chosen (making it a 6/10 with +1 spell damage).
It's also at least feasible to consider running Azure Drake and Twilight Drake in your hand, especially if you're using a lot of your mana to heal minions on the board instead of playing more cards.
Egg is the one that doesn't seem to fit especially well. Velen's Chosen would at least let it generate a lot of whelps, but that's 4 mana between the two, and one of the only cards that actually buffs the thing to usefulness. Even if we assume you're running two Defenders of Argus due to all the tanky minions, you're still likely to end up in situations where you only get one whelp out of it, not making it worthwhile.
However, I don't feel this is enough to actually make a deck work. While you have some good early value trading, you ultimately either need combos to make even that work, or you're betting a lot of healing mana on one minion that could get removed. You also have a large void getting to the 9 cost dragons, which generally aren't extremely strong game winners. The deck is essentially way too fair to actually get played in constructed only using what's revealed so far.