Leonardo Da Vinci, The Mind

When Leonardo Da Vinci, The Great Mind enters the battlefield, create a 0/0 colorless Construct artifact creature token with “This creature gets +1/+1 for each artifact you control.”
Tap an untapped artifact you control: Add {u}
{5}: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.