Urza, Lord High Artificer (Terra Branford) Foundations it produces {B} instead of

it produces {B} instead of any other type and amount

If two cards that share a color were milled this way

Each opponent can't draw more than one card each turn

you may reveal cards from the top of your library until you reveal a creature card

+ {2} — Creatures you control get +1/+0 and gain first strike until end of turn

Urza, Lord High Artificer (Terra Branford) Foundations it produces {B} instead ofWhen 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.