diff --git a/cardsim/card.go b/cardsim/card.go
index 9e8f1ed..df5cc07 100644
--- a/cardsim/card.go
+++ b/cardsim/card.go
@@ -16,6 +16,11 @@ type Card[C StatsCollection] interface {
 	// Options returns the possible actions the player can take for this card.
 	// There must be at least one option.
 	Options(p *Player[C]) ([]CardOption[C], error)
+
+	// Then is invoked after an option is selected and executed. The selected
+	// option is provided as an argument. This allows cards to do certain
+	// cleanup for every action -- for example, returning to the deck.
+	Then(p *Player[C], option CardOption[C]) error
 }
 
 // A CardOption represents a choice a player could make for some card.
@@ -35,11 +40,12 @@ type CardOption[C StatsCollection] interface {
 	Enact(p *Player[C]) (Message, error)
 }
 
-// A BasicCard is a Card with fixed title, text, and options.
+// A BasicCard is a Card with fixed title, text, options, and optional post-option callback.
 type BasicCard[C StatsCollection] struct {
 	CardTitle   Message
 	CardText    Message
 	CardOptions []CardOption[C]
+	AfterOption func(p *Player[C], option CardOption[C]) error
 }
 
 func (b *BasicCard[C]) Title(p *Player[C]) (Message, error) {
@@ -54,6 +60,13 @@ func (b *BasicCard[C]) Options(_ *Player[C]) ([]CardOption[C], error) {
 	return b.CardOptions, nil
 }
 
+func (b *BasicCard[C]) Then(p *Player[C], option CardOption[C]) error {
+	if b.AfterOption == nil {
+		return nil
+	}
+	return b.AfterOption(p, option)
+}
+
 // A BasicOption is a CardOption with fixed text, effects, and output.
 type BasicOption[C StatsCollection] struct {
 	Text   Message