Captain played as Border Guard reveals only 2 cards

[JW]

I was playing Captain as Border Guard, with the Horn, and it only revealed 2 cards. Playing Border Guard worked fine to reveal 3 cards. Game #29417160 on frankfurt

J plays a Border Guard.
J gets +1 Action.
J shuffles their deck.
J reveals a Bazaar and a Patron.
J gets a Coffers from Patron.
J puts a Bazaar into their hand.
J discards a Patron.
J plays a Captain.
J plays a Border Guard.
J gets +1 Action.
J reveals a Graverobber and a Patron.
J gets a Coffers from Patron.
J puts a Graverobber into their hand.
J discards a Patron.

[dane]

I was playing Captain as Border Guard, with the Horn, and it only revealed 2 cards.

That's because Captain plays a Border Guard from the Supply, so that Border Guard is not yours, so does not benefit from Lantern's wording "Your Border Guards reveal 3 cards and discard 2." (my emphasis)

[JW]

Thank you! I didn’t realize.

[Ingix]

It's not a very intuitive interaction, because most people internalize Lantern as being applicable when they play a Border Guard. It's mostly the same, but in rare cases (Captain, Necromancer, Band of Misfit, Overlord) it's not.