Typically, you want to play Rarity early so you get the most value out of her cost reducing (including the two above) and prepare to use her as a way to protect your other high value creatures
Lethal Scheme Removal is needed at instant speed too, though, and so I want to talk about Lethal Scheme next
VAT 2.52 when you buy any 4+ 2.02 when you buy any 10+ 2.52 when you buy any 4+ 2.02 when you buy any 10+ 3.36 incl
Aeve, Progenitor Ooze can indeed be used in an ooze tribal, but there are several ways to create combos and situations where your storm count is high and capable of generating several massive slimes, thanks to Storm
Eater of Hope $0.50 This is decent in casual Reanimator/Commander decks that want a good repeatable sac outlet
To fill out our list we would like to play to the potential synergies available with Oketra's Monument - that is dropping white creature spells a full turn earlier and perhaps something to buff up all those 1/1 white Warrior creature tokens we want to produce