Collector's edition looks like beta on the front (black border) but with perfectly square corners and the back is gold. This set is not legal in tournaments.
Chronicles is a set of white-bordered cards reprinted from Arabian Nights, Antiquities, Legends, and The Dark. These cards do have their original set symbols o them.
Battle Royale is a set with versions of cards - including the original set symbols - from many previous sets but with white borders. Note then, there is no "Battle Royale" set icon.
Deckmasters is a set of 124 cards with versions of cards from previous sets but with white borders. This set has a unique symbol:
Starter 1999 are white-bordered cards with a small star as the expansion symbol.
Starter 2000, unlike the Starter 1999 set, is only a partially unique set. All 6th Edition cards included in this set are identical to their original printing. The other cards in this set have white borders (like Starter 1999) but no expansion symbol (unlike Starter 1999). These cards are unique to this set and the only ones listed on CardShark from this set.
Vanguard is a special promotional set with very large cards and styled text. The printing on this set is easily chipped at the edges, and mint cards are harder to come by:
Unglued (and recently, Unhinged) are special fun sets with silver borders. Unglued also includes a handful of popular tokens that have silver borders, like Squirrel and Zombie. This set features our favorite card(s) Big Furry Monster:
Have a question about an obscure or promo card you can't find here? Try the Magic Library*