When you call Royal Carriage on a card (or throne room, kings court, disciple, procession) you only copy the instructions above the dividing line.
Some cards in dominion say "while this is in play, ..." explicitly to prevent being copy-able. The original is in play, the copy is not.
In other words... you can copy a Bridge, but not a highway. Well, you can, but you only get the +1 card +1 action twice, not the cost reduction.
Some cards in dominion say "while this is in play, ..." explicitly to prevent being copy-able. The original is in play, the copy is not.
In other words... you can copy a Bridge, but not a highway. Well, you can, but you only get the +1 card +1 action twice, not the cost reduction.