remove T type from OptionalAdditionalCostImpl. The class was of a type that extended itself. No idea how to interpret that.
@@ -30,9 +30,8 @@ package mage.abilities.costs;
/**
*
* @author LevelX2
- * @param <T>
*/
-public class OptionalAdditionalCostImpl<T extends OptionalAdditionalCostImpl> extends CostsImpl<Cost> implements OptionalAdditionalCost {
+public class OptionalAdditionalCostImpl extends CostsImpl<Cost> implements OptionalAdditionalCost {
protected String name;
protected String reminderText;
