PS - The Ambush from the Plains Hatchling combines extremely well with Dragon Bite, as long as its adult version is not in play.
Unless I read incorrectly (which is entirely possible) you can also abuse the following in a Targ Maester deck:
Advisor to the Crown (which At the Gates will fetch for you)
Copper Link (tucked into the Maester agenda)
Any 2-cost or less ambush character.
Kneel the Advisor for 2 Influence to put the ambush character into play. Then use the Response on the Copper Link to give that character the "Dragon" trait until the end of the phase. My rules question here is if you resolve the Influence + Ambush before using the Copper Link. If so, then this combos with:
Dragon Attack, Dragon Bite, and Dragon Fear. Also The Dragon Strikes, if you have another Influence kicking around.
Drogon, Rhaegal, and Viserion. As long as your ambushing character gets 'Dragon', then their dragon-only bonuses should work.
Daenerys QoD. Ambushing dragons do not kneel to attack.
Horn of Dragons. It's a Greyjoy item, but may be worth paying 4 gold if you're turning the OTHER player's characters into dragons.
Astapor, Meereen, Qarth, and Yunkai. All the Targ dragon-buffing locations basically.