If you are willing to give up the fifth through eighth best cyclers in your deck for slightly better existing removal options, Jim Davis had a nice-looking Jeskai list last week that I would start with
Instant Color tag templates(None) Flame Jab Flame Jab deals 1 damage to any target
You favor the former over the latter to get an enters- and leaves-the-battlefield triggers on your creature
But Dragon Tempest on its own is pretty impressive in this deck
Its a nice effect on the left door, especially if you have a good 1-drop to play, then the more expensive right door is a way to win the game, providing your board manages to dodge a Sunfall
Playing the Overlord on three will put you at four lands that turn, and if you have another land drop on your fourth turn, you can cast another Overlord for the full five mana, as a creature this time, while further ramping you to six lands