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While on the topic of mill effects that have flexibility in their uses, some black and Dimir cards come to mind

To add value to the flashback version, some top-of-the-library control is in order, like Scroll Rack or some kind of tutor

10 Swords Of Revealing Light - Retro Pack ($1,999 USD) This spell card as a part of the Retro Pack goes for a heaping $1,999, and fans aren't even phased by it

And even more surprising, all of them seem to point toward a slower, more methodical style of play that white has not always supported in Standard

The idea was that it would be a creature with a cost and stats that allowed it to get an ability, and then that ability would change by season