Urza, Lord High Artificer

When Urza, Lord High Artificer enters the battlefield, create a 0/0 colorless Construct artifact creature token with "This creature
gets +1/+! for each artifact you control."

Tap an untappted 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.