Urza, Lord High Artificer - 296 M DMR

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 {U}.
{5}: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.

mythic
Legendary Creature — Human Artificer
From the Magic: The Gathering set Dominaria Remastered.