Urza, Lord High Artificer (Borderless Alternate Art) [Dominaria Remastered] RT4 You may spend mana as

You may spend mana as though it were mana of any type to cast creature spells

But the Ants seemed to disagree

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Set: Mystery Booster Type: Sorcery Rarity: Uncommon Cost: {1}{B} Search your library for a card

*Also includes alternate art and/or design cards from the above types

Urza, Lord High Artificer (Borderless Alternate Art) [Dominaria Remastered] RT4 You may spend mana asSet: Dominaria Remastered Type: Legendary Creature Human Artificer Rarity: Mythic Cost: {2}{U}{U} When Urza, Lord High Artificer 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.