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Of the five, I really like God-Eternal Oketra in just about any white-based deck that has a good number of creature cards since it doesnt take many cards invested to generate a threatening army
Selfless Squire: In Commander, you are more likely to have four unused mana
Hating on the graveyard is a big upside, though if you build your deck to make the best use of the ability then it might not work so well
Most madness cards get a highly reduced cost when played for madness, so as long as you have a somewhat decent mana base on the field, you can draw a ton of cards while also playing everything you discard
This artifact creature is a 4/5, so you'll have to plan your attacks carefully if you want to make the best of the lifelink ability and its Energy counter boost