You could sacrifice a creature an opponent owns if you gain control over it, but this is also a relatively rare occurrence
Its first lore counter makes a 1/1 Mouse token, which gives us a body for chump blocking and eventually to beat our opponent down with
Rise of the Dark Realms It Costs Nine Mana, But Its Worth It A nine-mana sorcery-speed spell better be utterly devastating when it resolves, and in the case of this card originally printed in the Magic 2014 core set, it certainly is
2 menace 3 vigilance 4 lifelink 5 flying 6 indestructible Illustrated by Ralph Horsley Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
She is the priciest pick on this list, a genuine chase mythic from Dominaria United, but she doubles as a centerpiece for your binder and is about as simple to pilot as a powerhouse gets
Plus, there are so many good cards that cost nothing to buy, you can often build decent Commander decks for less than 20