Lyla, Lightsworn Sorceress

LIGHTEffect Monster

You can target 1 Spell/Trap your opponent controls; this card's battle position cannot be changed until the end of your next turn, also change this card you control from face-up Attack Position to face-up Defense Position, and if you do, destroy that target. Once per turn, during your End Phase: Send the top 3 cards of your Deck to the GY.