Set aside a card from your hand.
At the start of your next turn, discard the card and gain an Action card into your hand which costs no more than it.
While this is in play, when another player plays an Attack, +1 Victory Point.
Place the set aside card face up on the Banner to remember what it's for, until the start of your next turn, when you discard that card and gain an Action card directly into your hand.
If there are Action cards available which cost equal or less than the set aside card, you must gain one of them.
If there are no Action cards available which cost equal or less than the set aside card, you do not gain a card.
If you do not have a card to set aside, or the set aside card is removed before the Duration completes (such as via the Admiral), then you do not gain a card.
While this is in play, you gain a Victory Point every time an Attack is played by another player, per copy of Banner you have in play. For example, if you have two Banners in play and someone else plays Militia, you would gain +2 Victory Points. You get no points from your own Attacks.
However if you Throne Room a Banner, despite having played the card twice, there is still only one copy of it in play, so it would only get you one Victory Point per Attack.
Leave this card in front of you until the Clean-up phase of your next turn.