Mijo, the Bull 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 Mijo enters, create a colorless Equipment artifact token named Rock with "Equipped creature has ", : Sacrifice Rock: This creature deals 2 damage to any target." and equip . From Downtown — If a source you control would deal exactly 2 damage to a permanent or player, it deals 3 damage instead.