As long as you have your commander in play
Cauldron Familiar Aside from being my favorite black card ever printed, Cauldron Familiar is an insane creature that has wrecked many formats, including Eternal ones such as Modern, thanks to its nasty tendency of being oppressive enough to shut down aggro decks, or even to go infinite with cards such as Samwise Gamgee and any sacrifice outlet
This is largely due to his first ability, which gives you a Food whenever a nontoken creature enters the battlefield under your control
Prince Eric, Dashing Brave is a reprint and a strong one that pulled its weight during The First Chapter and will again in Might and Magic
But I just couldnt resist including him here, as you get a really cool winning strategy
You gain a ton of life in the deck, and easily enough to discount the entire generic mana cost of any spell you want to cast