When you find yourself with a wide-open theme and zero concerns around playability, its up to the individual to pick one game plan and keep their deck building focused
Few cards are outright banned in Vintage, and those are special cases like dexterity cards such as Chaos Orb, cards that dont work in the format like attractions, conspiracy or ante cards, or a set of cards that are racially and/or culturally insensitive
I'm not sure it's necessary, but it is game warping
The 4 Main MTG Rarity Levels booster pack
Lets say youre running 4 of these in a Boros Field of Ruin deck and you are struggling against sac, throw a forest and a few Yasharn into your board
Humorously, Snow Mercy seems to depict the very same Phyrexians on No Mercy, but theyre now frozen in a magical snow globe