Rework implementation of anchor words (#13518)

* refactor anchor word implementation

* fix error

* [TDM] Implement Windcrag Siege

Mage/src/main/java/mage/constants/ModeChoice.java

@@ -0,0 +1,75 @@
+package mage.constants;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.game.Game;
+
+import java.util.Objects;
+
+public enum ModeChoice {
+
+    KHANS("Khans"),
+    DRAGONS("Dragons"),
+
+    MARDU("Mardu"),
+    TEMUR("Temur"),
+    ABZAN("Abzan"),
+    JESKAI("Jeskai"),
+    SULTAI("Sultai"),
+
+    MIRRAN("Mirran"),
+    PHYREXIAN("Phyrexian "),
+
+    ODD("odd"),
+    EVEN("even"),
+
+    BELIEVE("Believe"),
+    DOUBT("Doubt"),
+
+    NCR("NCR"),
+    LEGION("Legion"),
+
+    BROTHERHOOD("Brotherhood"),
+    ENCLAVE("Enclave"),
+
+    ISLAND("Island"),
+    SWAMP("Swamp"),
+
+    LEFT("left"),
+    RIGHT("right");
+
+    private static class ModeChoiceCondition implements Condition {
+
+        private final ModeChoice modeChoice;
+
+        ModeChoiceCondition(ModeChoice modeChoice) {
+            this.modeChoice = modeChoice;
+        }
+
+        @Override
+        public boolean apply(Game game, Ability source) {
+            return modeChoice.checkMode(game, source);
+        }
+    }
+
+    private final String name;
+    private final ModeChoiceCondition condition;
+
+    ModeChoice(String name) {
+        this.name = name;
+        this.condition = new ModeChoiceCondition(this);
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+
+    public ModeChoiceCondition getCondition() {
+        return condition;
+    }
+
+    public boolean checkMode(Game game, Ability source) {
+        return Objects.equals(game.getState().getValue(source.getSourceId() + "_modeChoice"), name);
+    }
+}