Ok so, first of all, summoner's pact is almost single handedly responsible for the consistency of this deck. Think of it this way- you only use it when comboing, and it is a wild card for any creature in your deck. When you are comboing it is free since you will have plenty of mana. The #1 target to start a combo is, sure, either nettle or heritage, but mid combo visionary is the main target. This summoners pact into essentially draw two cards for free while glimpsing. It becomes anything you need at any given time, and if you care clever enough, it will give you an extremely high combo consistency with this deck.
As for Genesis wave, you said x=7 would be a small wave, so you need 10 mana to pull this off. If you have a summoner's pact, you can cast a regal force for three less than that and most likely get more cards, and if you don't, if you have a wish, you can cast a regal force for one less than your suggested wave and still most likely get more cards out of it. Consistency with this deck comes from cards that are never dead, that's why summoner's pact and wish are awesome, but genesis wave is dead until later in the combo, at which point there will always be better options to cast. It's not horrible, it's just not better than other cards that we can use.
Genesis wave, to me, is just a worse regal force. It costs more for less card advantage, and if you are glimpsing, you don't get to draw for the guys that enter the field. Thus, wave actually hurts your combo since it takes aways a bunch of glimpse fuel and puts them on the field as if glimpse was inactive.