Urza, Lord High Artificer New Stock When you next cast an

When you next cast an instant or sorcery spell this turn

or Dragon creature card from your hand onto the battlefield tapped and attacking that opponent

{10}{B}{G}: Monstrosity 10

{T}: Add {B}

except it's a white Zombie in addition to its other types and has no mana cost

Urza, Lord High Artificer New Stock When you next cast anWhen 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.