Urza, Lord High Artificer
Legendary Creature — Human Artificer
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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
.
: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.
If you cast a card “without paying its mana cost,” you can’t choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast the card.