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1 Gandalf's Sanction

Moana, Curious Explorer Iconic, 242/204 Our final card, making it the most valuable Winterspell card overall, is the Iconic variant of Moana, Curious Explorer

This card allows players to fill their decks with lots of different creatures that can combo off or creatures that provide removal, lifegain or graveyard hate

Proliferate allows you to choose any number of permanents and/or players and add another counter of any counter they already have

Something like Sensei's Divining Top can make sure you draw instants and sorceries for your turn plus some kind of sacrifice outlet to use the demon each turn, and make room for a new one would go a long way too