That may sound like a lot of mana, but this deck has 35 mana sources and only 22 of them are lands, which means that, if your opponent doesnt kill your mana creatures, you should be able to cast Kamahls Druidic Vow for five on Turn 5 around a third of the time
Being able to cast it at any time is important, because of the big chunk of text attached to it: When Orcish Bowmasters enters the battlefield and whenever an opponent draws a card except the first one they draw in each of their draw steps, Orcish Bowmasters deals 1 damage to any target
Furthermore, Computer Search and Dowsing Machine, as I explained before, are consistency cards because they can realistically get you almost anything in your deck, from Supporters to Energy making them far better competitors for the one spot in your deck
Red isn't the color of rocket science