Lyla la Magicienne, Seigneur Lumière LODT-FR019

You can change this Attack Position face-up card to Defense Position face-up and destroy 1 Spell or Trap Card controlled by your opponent. If you activate this effect, the battle position of this card cannot be changed until the end of your next turn, except by the effect of a card. During each of your End Phases, send the top 3 cards of your Deck to the Graveyard.