When Melusine enters the field, choose 1 Forward of cost 4 or less. You gain control of it until the end of the turn. 0: Until the end of the turn, Melusine also becomes a Forward with 7000 power and "When Melusine is chosen by your opponent's Summons or abilities, if your opponent doesn't discard 1 card, cancel its effect." You can only use this ability once per turn.