Kuzan reinvents the standard resource management of black decks, which traditionally forces players to aggressively discard cards from their hand to activate powerful removal or cost-reduction effects
Using your 1/1 token creatures as a disincentive for your opponent attacking and chump blocking big attackers just proved to be too efficient, so we added on "can't block." We then looked for various ways to create a number of Mite creature tokens, like when a creature enters the battlefield or dies
Go for Blood is played as a one-mana almost-Opt most of the time
Then you get a 5/5 body with forestwalk, which should be quite common here with the many dual land running around and Green is pretty common
Forge Anew works as a recursion device in case you lose any Equipment cards via an opponents removal spell, for example, but its main value is granting you a free Equip action on each of your turns
Then the Green one that finishes us will return two cards of the permanent size and then exile