ported from perforce

RobotAndDonkey.Game/Modifiers/EfficientModifier.cs

@@ -0,0 +1,12 @@
+using RobotAndDonkey.Game.Execution.Results;
+using RobotAndDonkey.Game.GameState;
+using RobotAndDonkey.Game.Intents;
+
+namespace RobotAndDonkey.Game.Modifiers;
+
+public record EfficientModifier(EModifierDuration Duration) : Modifier(EModifierKind.Card, EModifierId.Efficient, Duration)
+{
+    protected override EfficientModifier CreateInstance() => new(Duration);
+
+    public override string ToolTip => "This instruction consumes no tape space";
+}