The only card I can see being useful to suggest here would be Genesis. It has proved various times to me that it is worth the slot that it takes up in my own Nylea list which I am currently priming up into a very similar version of this actually, difference being the curve spot and the type of ramp. I've been playing in a control heavy meta for about three years and found that creature ramp is a horrible idea when that is what your up against. Alongside the fact that it is never hard for you to hit 7-8 mana by T5 if you go this route as well.

The_Notebook, I've found Genesis to be a trap card. It was in an original version of the deck, but it's since been removed. If it's milled, great. If you find it in your hand, however, you need to find some way to get rid of it, and that's reasonably difficult. Opponents are more likely to let it through than block it, and the only way it's going to get removed from the field is a board wipe. It's extremely useful for getting back what I need, but the difficulty to get it into the graveyard and the fact that I can't even get something for it immediately outweighs the benefit of running even a one-off recursion spell.

As for creature ramp, I've found that it's pretty much the only way to get a solid footing. This deck can get blown out by a wrath if you have few cards in hand, but the alternative is casting land ramp spells starting turn 3, or if you're really lucky, turn 2 with either Sakura-Tribe Elder or Rampant Growth. The deck uses creature ramp to get started, but I'll find I'll rarely keep a hand unless I know that I can replace whatever I'm playing with a draw spell, or unless the creature-based ramp is accompanied by land-based ramp.