Elegy Acolyte is another card that is doing a lot of work across a lot of effects, and I'm surprised it's not a mythic
All you have to do is sacrifice your two Thopters to the Altar to gain four mana, then, with Nim Deathmantle equipped to Breya, sacrifice Breya to the Altar for a total of six mana
His Lucky Dime is a usable item, and it's quickly found a home among many decks for its lore-boosting capacity
Youll rarely want to send these cards to the Lost Zone, and your first couple of turns of the game will usually find you using many, many, many copies of them to achieve your Lost Zone goals
Some more permanents to help ramp and enable dragon decks come from the Tarkir: Dragonstorm set
Mishra's Factory is still a fine card and has plenty of application but it is far from an auto include in aggro lists, even mono coloured ones (apart from the fact there are often other better colourless lands options on offer)