[KHM] Implemented Draugr's Helm (#7393)

* [KHM] Implemented Draugr's Helm

* Implemented CreateTokenAttachSourceEffect and refactored existing cards to use it

Mage/src/main/java/mage/abilities/effects/common/CreateTokenEffect.java

@@ -111,7 +111,7 @@ public class CreateTokenEffect extends OneShotEffect {
         }
     }
 
-    private void setText() {
+    void setText() {
         StringBuilder sb = new StringBuilder("create ");
         if (amount.toString().equals("1")) {
             sb.append("a ");