Call a royal carriage on a card that is in your opponent's play area.
Is it possible to call Royal Carriage after playing an Action which I played and which is in my OPPONENT's play? I mean,
I Inherit Crown, Sally Inherits Caravan Guard.
play Estate1 to play Estate2 twice
- play Estate2 to play Estate3 twice
--- play Estate3 to play Throne Room twice
----- play Throne Room to play University twice
------- play University to gain Mandarin
--------- reveal Watchtower to trash
------- play University to gain Cultist
--------- reveal Watchtower to trash
----- play Throne Room to play Ambassador twice
------- play Ambassador to put back Estate3
------- play Ambassador
--------- Sally plays Estate4 to draw Estate3
--------- Sally plays Estate3
--------- I revealed Estate2
--- play Estate3 (which is in Sally's play) as Caravan Guard
----- call Royal Carriage to replay Estate3 (which is still in Sally's play)
Is it legal? Lighthouse's "in play" means "in my play", and Grand Castle's one means "in our play", I suppose.