Sigarda, Host of Herons EDH 1 vs 1 aggro (EDH / Commander)

If Bruna, light of Alabaster appeals for Jhonny, and Gisela, Blade of Goldnight for Timmy, Sigarda, Host of Herons finds home in Spike decks.
This is an aggressive deck meant to play 1 vs 1 duel, with Sigarda, Host of Herons as the commander and central piece to win the game. Sigarda is a very good commander to have in that kind of game, that is, when you're the aggressor playing against a single opponent. Here are the reasons why: She's not very expensive to cast, she's green, which allows you to easily ramp and play her before the 5th turn, she has 5 power and an evasive ability (flying) meaning that, unblocked, she'll kill your opponent in 5 attacks, and last but certainly not least, she's very hard to kill.
So the main idea of this deck is to get Sigarda, Host of Herons on the battlefield ASAP and swing for 21+ damage. Very simple, uh? With that in mind, I searched for the most effective ramp spells I could find, ways of giving her haste and increase her power to at least 7 to be able to deal 21+ damage with only three attacks.
I know that while trying to ramp your way to 5 mana to get Sigarda on the battlefield your opponent won't be just sitting and waiting, he/she will probably have some defensive strategy (which if I'm wrong, that is, if they don't have one, they'll be screwed anyway) so, as you'll see on the decklist, there are lots of cards to disrupt most, if not all, defensive strategies your opponents might come up with - most of these strategies rely on artifacts and/or enchantments, yet some use lands like Maze of Ith or Kor Haven, but those two won't work against Sigarda.
One of Sigarda's vulnerability is that she's not indestructible (the card is already broken as it is, who could ask for more?), though she can't be targeted, she dies to spells like Wrath of God and its kind; another vulnerability that she has is that she can be countered; with that in mind I put some cards in the deck that can go around those vulnerabilities.