[CMM] Implement Nyxborn Behemoth (#10670)

* [CMM] Implement Nyxborn Behemoth

Regroup the different dynamic values for "total mana value of [FILTER]" under a shared class.

* refactor hints inside TotalPermanentsManaValue

* apply review on TotalPermanentsManaValue->copy

Mage/src/main/java/mage/abilities/dynamicvalue/common/TotalPermanentsManaValue.java

@@ -0,0 +1,64 @@
+package mage.abilities.dynamicvalue.common;
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.effects.Effect;
+import mage.abilities.hint.Hint;
+import mage.abilities.hint.ValueHint;
+import mage.filter.FilterPermanent;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+
+import java.util.List;
+
+public class TotalPermanentsManaValue implements DynamicValue {
+
+    private final String message;
+    private final ValueHint hint;
+    private final FilterPermanent filter;
+
+    public TotalPermanentsManaValue(FilterPermanent filter) {
+        this.filter = filter.copy();
+        this.message = "the total mana value of " + filter.getMessage();
+        this.hint = new ValueHint("Total mana value of " + filter.getMessage(), this);
+    }
+
+    private TotalPermanentsManaValue(final TotalPermanentsManaValue value) {
+        this.filter = value.filter.copy();
+        this.message = value.message;
+        this.hint = value.hint.copy();
+    }
+
+    @Override
+    public TotalPermanentsManaValue copy() {
+        return new TotalPermanentsManaValue(this);
+    }
+
+    @Override
+    public int calculate(Game game, Ability sourceAbility, Effect effect) {
+        int totalCMC = 0;
+        List<Permanent> permanents = game.getBattlefield().getActivePermanents(
+            filter,
+            sourceAbility.getControllerId(),
+            sourceAbility,
+            game);
+        for (Permanent permanent : permanents) {
+            totalCMC += permanent.getManaValue();
+        }
+        return totalCMC;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+
+    @Override
+    public String toString() {
+        return "X";
+    }
+
+    public Hint getHint() {
+        return hint;
+    }
+}