Sky Striker Mecha - Widow Anchor (Starlight Rare) (MAMO-EN019) [Magnificent Monsters]

If you control no monsters in your Main Monster Zone: Target 1 face-up Effect Monster on the field; negate that face-up monster's effects until the end of this turn, then, if you have 3 or more Spells in your GY, you can take control of that monster until the End Phase.