What are some of the most popular MTG silver border cards and how do they differ from regular cards in terms of gameplay and rules?

Some popular silver border Magic: The Gathering cards include "Chaos Orb," "Spike, Tournament Grinder," and "B.F.M. (Big Furry Monster)." Silver border cards are considered "un-cards" and are not legal in official tournaments. They often have unique and humorous effects that break traditional game rules, leading to unpredictable and fun gameplay.