Have you seen D/D/D Oblivion King Abyss Ragnark
Paying one life to create a 1/1 creature token can often make a huge difference if you need to chump block some huge creature without evasion, but the real dream is to sacrifice five token creatures you may have produced to transform Westvale Abbey into Ormendahl, Profane Prince
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Benevolent Offering: In some unusual cases, the Spirit tokens will have a toughness of 0 or less as they enter the battlefield, perhaps because an opponent controls an enchantment that gives your creatures -1/-1
this can be used to search+destroy "Fire King" monsters that immediately generate advantage (see above
If you can threaten to sacrifice something, it makes that an even less attractive option, and even if you can't, your foes will still fear losing them in a suicidal attack, or even just being bludgeoned by their own pieces
I settled for Iteration because I think it is even better at what it does in Izzet Murktide, than what Wrenn and Six does in the 4-color decks