Fixed missing override, restored and additional comments

Mage/src/main/java/mage/MageObject.java

@@ -106,6 +106,21 @@ public interface MageObject extends MageItem, Serializable {
 
     void setStartingLoyalty(int startingLoyalty);
 
+    /**
+     * Dynamic cost modification for card (process only OWN abilities).
+     * <p>
+     * Usage example: if it need stack related info (like real targets) then must check two
+     * states (game.inCheckPlayableState):
+     * <p>
+     * 1. In playable state it must check all possible use cases (e.g. allow to
+     * reduce on any available target and modes)
+     * <p>
+     * 2. In real cast state it must check current use case (e.g. real selected
+     * targets and modes)
+     *
+     * @param ability
+     * @param game
+     */
     void adjustCosts(Ability ability, Game game);
 
     void adjustTargets(Ability ability, Game game);