Even if you weren't immediately boosted in this way, Nissa would still be pretty tricky to deal with, as she turns your lands into vigilant creatures that can attack and then block, right away
This lets you apply the evasive ability to a character until the start of your next turn, draw a card, gain one lore while making each opponent lose one lore, and you get to play Wind-Up Frog for free (assuming its in your hand)
Amazon is even undercutting the Jumpstart Boxs market price of $116.13 determined by TCGplayer
Most things get easier with that enchantment, to be fair
Although some iterations of this build like to get ahead with some early aggression Wargear offers too much blowout potential to be of much help in those more attacking builds
Sephiroth, the Savior is arguably one of the most iconic villains you could put on a Magic card, and its only fitting its on Atraxa, Grand Unifier