Commander Masters Enduring Enchantments precon came with a powerful new Enchantment Commander, and Wilds of Eldraine has continued to raise the bar with Eriette
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And fins
While most spells arent going to need to cost 10 less you could always use this with X spells, much like you can with Magus Lucea Kane
This is considered a win condition in a few ally builds
Let's look at mid-range here first