@Dieselite I get where you're coming from, but look:
Voracious hydra is removal by itself, and Oko can take out big threatening creatures. When it comes to card draw, Kiora and Krasis can handle it. I don't really know what you mean by removal defense, other than playing counterspells (black removal goes over combat tricky spells), which don't really fit into a ramp deck.
Veil of Summer out of the sideboard is the way to deal with black removal. For damage removal, the bug butts (toughness) is all we can hope for.
Maraleaf Pixie is a Fine card but since the deck is mostly green, we can't expect to have blue mana by turn 2 without having to add more taplands than a ramp deck can handle, and we do't really want to waste the
Gilded Goose mana on another mana dork creature.
On the subject of
Gilded Goose, since we're a Ramp deck, we will have plenty of mana to tap the Goose for additional food tokens to ramp even more on following turns.10 ramp creatures is plenty. They're backed up by Nissa and Kiora, so even if they die after we cast those PWs early, it's not a huge loss. We need the Goose to be able to play turn 3 Nissa, for example. (T1 Goose, T2 Druid, T3 Nissa)
Season of Growth is also a fine card, but it doesn't fit in a ramp deck either. We want to be playing mana dorks on turn 1/2 and 4/5 cmc cards on turn 3, not a fight spell when we may not even have big bodies on the board.
Gargos, Vicious Watcher is a legendary that costs 6 mana, Having multiples is a big
liability. I think 3 is the most you could safely play in any deck. Just imagine drawing 2 on your starting hand, or drawing another Gargos when you already have one in play instead of a different Hydra. So I think 2 is the right number, perhaps 3, but that's way too risky already to ever consider playing 4.
Your version is more of a Midrange approach to hydras, which is great too, but mine is a pure Ramp deck. It's designed to
overwhelm with big bodies early and have a slamming mid to late game.