Unicycling Automaton 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

Hand Backup 1 (When this creature enters the battlefield, you may reveal a creature card from your hand. When it eventually comes into play, if you cast it from your hand, it enters with a +1/+1 counter. It also gains the following ability in your hand until end of turn.) Basic Landcycling (, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)