Urza, Lord High Artificer (Retro Frame) (MH1-011) - Modern Horizons 1 Timeshifts Etched Foil

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