The Unluckiest Planeswalker is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Rulebreaker — A deck with this commander can have Aura cards of any color identity and any basic land cards. +1: Add one mana of any color. When you spend this mana to cast an Aura spell this turn, create a 1/1 red Gremlin creature token. −3: Discard your hand, then draw cards equal to twice the number of Auras you control. For each Aura attached to you, attach it to an opponent of your choice. The Unluckiest Planeswalker can be your commander.