You'll probably want enchantment creatures and artifact lands in Winter's deck, as well as some really big cards you can suddenly reanimate to terrify your foes
It also has the upside of being able to be cast with your creatures due to having convoke, so at times youll be able to cast it for effectively zero mana, which is absurd
Balzer Kardur, Doomscourge helms Chaos Incarnate
Bumbleflower on the battlefield, you make one of your opponents draw a card (Im sure you can see the politics of that coming into play already)
White Auracite is a nice little two-for-one special
Demilich In Modern, were currently seeing a resurgence of UR Delver-style decks brought about by Modern Horizons II all-stars Ragavan, Nimble Pilferer, Dragons Rage Channeler, and Murktide Regent