Every time you cast an instant or sorcery, you make a 3/3 Wraith token with menace
Thunder Flip a coin
In the pre-internet era, players who pulled the 83rd card from an 82-card set often believed it to be a counterfeit or a misprint
A tasty bonus is that this card triggers on your combat step not upkeep, which means you get some value immediately and are less likely to suffer a blowout
This artifact has a fun story attached to it, too: Originally, Skullclamp was designed to give a +1/+1 buff, but before seeing print the Magic designers thought that such a buff would make Skullclamp too powerful and they changed it to +1/-1
The decks cover key characters and events from Final Fantasy VI, VII, X, and XIV , though the main set also makes references to these games