Prominent from the dawn of MTG, dragons have had a whole MTG set dedicated to them in Dragons of Tarkir, and even gave rise to the popular Commander format, otherwise known as EDH or Elder Dragon Highlander
So, for a total of six mana, you can make Zack a respectable 4/6 with the Buster Sword equipped
Ive seen games where Archangel landed on a modest board, and two turns later, everything was massive
I did say that I dislike Cabal Coffers and similar Mono Black Control lands in this deck, but lands that 1) enter untapped and 2) tap for B are always worth considering: Shizo, Death's Storehouse and Takenuma, Abandoned Mire are top on the list, but for colorless lands I think Nykthos, Shrine to Nyx can probably start ramping by turn 4 and Phyrexian Tower is worth testing too
Choose one of five clans and discover your favorite way to play, then prepare your forces for nature's fury