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
Champions Helm Champion's Helm offers great protection for your commander, and it's finally cheap thanks to some Commander Masters and Fallout reprints
Alone, Celestine can bring back creatures three mana value or less, which is very on-theme for white reanimation
Maybe some kind of combo deck

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You have to hope the consistency you give up gets offset by the value of beginning every game with a Dualcaster Mage in hand