So it's a one-sided board wipe that leaves you in the perfect position to win the game
It would go to the graveyard and the next card would be turned face up and be in play (assuming it's a permanent)
The inclusion of the keyword here takes Aeve from a 2/2 for five mana to a potential game-ender with a single stroke
There are cards to quickly fill your graveyard, such as Stitcher's Supplier and Faithless Looting , and then plenty of cards that bring milled cards back to either your hand ( Graveshifter , Eternal Witness ) or even directly into play ( Deadbridge Chant , Liliana, Death's Majesty )
Search your library for up to two land cards, put them onto the battlefield tapped, then shuffle
If you do, return Lightning Phoenix from your graveyard to the battlefield