Theyre one of blacks characteristic creature types, which means they show up in just about every new MTG set
Cultivate always has a place in green decks, and heres the list of other ramp cards in the deck, to get more card draw, forests, mana, or creatures onto the battlefield: This ought to get the deck moving out of the gate
Akiri, Line-Slinger is your first partner, a two-mana commander with first strike and vigilance and whose power is entirely dependent on how many artifacts you control
It can always come back to the battlefield so long as you have the six mana to pay for the ability, and can be done at instant speed, letting you use any unused mana to bring it back so you have it on your battlefield before your turn starts
One other subtle strength here is the degree of control you can have over exactly when cards are milled, and how many (assuming you have painlands or other unrestricted self-damage sources)