This is because whenever Millicent or a nontoken Spirit you control deals combat damage to a player or dies, you create a 1/1 Spirit token with flying
This is enough to single-handedly power out some of your other creatures, or tutor for them via Green Suns Zenith
(Treat phased-out creatures and anything attached to them as though they don't exist until their controller's next turn.) Target creature phases out
I sadly couldn't fit in that entire image of Winged Dragon of Ra so you see what the full thing looks like here i.pinimg.com/originals/ae/67/f Image size 1406x653px 1.64 MB 2021 - 2026 GodDragonKing
It wasn't for Standard, but in colorless EDH decks like Zhulodok, Void Gorger or certain artifacts decks, Liberator, Urza's Battlethopter really helps drop stuff in end steps
I left very happy and would give my highest recommendation if you have old collectibles to sell