Blue has it unconditionally, black lets you trade life for it, green often bases it on your creatures, and red has you discard cards in exchange for a draw, but white has almost nothing
Three reasons justify the inclusion: first, Gilgamesh, Master-at-Arms' ability only attaches one Equipment to itself from among the top six cards of your library
Even outside of triggering our payoffs, having a bunch of card draw is pretty powerful, letting us dig through our deck for removal and threats and making it super hard to flood out since, if we happen to draw too many lands, we can always discard them to Thirst for Discovery or Tainted Indulgence
They ultimately do much the same thing in this archetype but Elder does it more conveniently, appropriately and better
Dakkon has the potential for getting huge as you play more lands, but without green for the ramp Dakkon Blackblade is just a Commander who's tragically in the wrong colours for our modern game