The rules text doesn't specify Magic
Sadly, because Plotted cards do need to wait a turn to be cast, this is likely the earliest you could get it out outside of eternal formats
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If your deck is trying to cast as many X spells as possible every turn, and wants X to be as much as possible, we probably want to prioritize ramp more highly than just 8 or 10 spells - in fact, I can see running 60 mana sources, like this Vaevictis Asmadi, the Dire deck
Its up to you if you wanna double-sleeve but be wary if you do
Sauron, Lord of the Rings When you cast this spell, amass Orcs 5, mill five cards, then return a creature card from your graveyard to the battlefield