Lander Rizzi 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

When Lander enters, create X lander tokens (They're artifacts with ", , Sacrifice this token: Search you library for a basic land card, put it onto the battlefield tapped, then shuffle.) Landerfall — Whenever a lander you control enters, put a +1/+1 counter on Lander. , , Sacrifice Lander: Search you library for a basic land card, put it onto the battlefield tapped, then shuffle.