Richard Garfield was a math professor, after all
Keywords are mostly straightforward to read and use
If Neva leaves the battlefield while it has an Aura you control attached to it or at the same time as another creature with an Aura you control attached to it, its ability won't trigger for those enchantments unless they were destroyed by the same effect that caused Neva to leave the battlefield
Just as a little bonus, its ultimate ability is also pure value, giving you an emblem that turns the lands in your hand into flashback-versions of the spells in your graveyard, cause why not
It seems obvious to ascribe Grixis to the forces of evil, but it works for a reason
Theres a lot of text on this card: it lets you cast Insect spells from your graveyard, mills cards whenever an Insect dies, and it even has a mana sink that makes your Insects stronger and more poisonous venomous