The Standard-legal MTG set was released on July 23, breaking Magic tradition by replacing the typical Core Set , while also breaking sales records
This works specifically, whenever you cast instants or spells on a creature you control, allowing you to exile the card after resolving it, instead of putting it in your graveyard to then be put back into your hand on the next end step
If youre storming off, you can always shatter your own rocks to keep spinning those wheels
For example, you could choose Veyran, Voice of Duality as your commander and build a spellslinger deck around it that uses its ability to get tons of value out of cards that care about casting instants and sorceries
It's Legendary because if it wasn't it would be completely broken
If your opponent overextends, Be Prepared can dramatically set them back and give you the opportunity to catch up