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Mage/src/mage/abilities/dynamicvalue/common/SignInversionDynamicValue.java

@@ -0,0 +1,37 @@
+package mage.abilities.dynamicvalue.common;
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.game.Game;
+
+public class SignInversionDynamicValue implements DynamicValue {
+    private DynamicValue value;
+
+    public SignInversionDynamicValue(DynamicValue value) {
+        this.value = value.clone();
+    }
+
+    SignInversionDynamicValue(final SignInversionDynamicValue dynamicValue) {
+        this.value = dynamicValue.value.clone();
+    }
+
+    @Override
+    public int calculate(Game game, Ability sourceAbility) {
+        return -1 * value.calculate(game, sourceAbility);
+    }
+
+    @Override
+    public DynamicValue clone() {
+        return new SignInversionDynamicValue(this);
+    }
+
+    @Override
+    public String toString() {
+        return "-" + value.toString();
+    }
+
+    @Override
+    public String getMessage() {
+        return value.getMessage();
+    }
+}