Flying Mary, the Wandering Ghost Ship

“2 Zombie monsters You can target 1 of your Level 5 or higher Zombie monsters that is banished or in your GY; place this card in your Spell & Trap Zone as a face-up Continuous Spell, and if you do, Special Summon that monster. While this card is a Continuous Spell: You can target 1 Level 5 or higher Zombie monster you control; destroy 1 monster your opponent controls with ATK less than or equal to that monster. You can only use each effect of "Flying Mary, the Wandering Ghost Ship" once per turn.”