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Starnheim Unleashed doesnt technically fit our definition of an X-spell, but Ill lump it in here

If a creature with banding attacks, it can team up with any number of other attacking creatures with banding (and up to one nonbanding creature) and attack as a unit called a "band." The band can be blocked by any creature that could block a single creature in the band

1 2 "'Magic: The Gathering' angers fans with 30th anniversary collectible cards"

In Commander, most Warlock decks will have black in their color identity to make this card easily available

Yes, it is literally that simple

This gives a better chance to trade blows and really test the mettle of a deck, allowing for slower-paced, slightly more strategic games