Whenever Moralo attacks, your opponent may discard a card from his or her hand. If he or she does, the attack ends.
As long as Cad Bane is in any arena, Moralo gets Lucky 1.
Keywords
Lucky
Lucky X: A cumulative, static ability that means, "Each time this unit attacks or is attacked, you may re-roll up to X of this unit's attack dice or have your opponent re-roll up to X attack dice against this unit." Both players can use Lucky effects according to the rules for POP chances. Lucky is used only once after all triggered re-roll effects resolve. You can't re-roll more dice than are rolled for the attack. You may choose to roll any number of dice up to the Lucky value.