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I choose creatures every turn and continue to mill a player for 24 or so while they have to make a real decision about whether they want to play new spells or attempt to attack into my army of 1/3s

An easy way to mill yourself out is Demonic Consultation

This set of fetch lands are going to be the most expensive of the bunch, aside from maybe Prismatic Vista (mentioned below)

Transforming Etali, Primal Conqueror is mostly a last resort though, because why would you not want to keep casting Etali, Primal Conqueror to play all of your opponents' decks

Bonus points that it has an alternate art version, even if the original art is more fitting with my personal aesthetic

If you prefer efficiency, buy singles