Sphere Kuriboh (MP16-EN121) - 2016 Mega-Tins Mega Pack Unlimited

When an opponent's monster declares an attack: You can send this card from your hand to the Graveyard; change the attacking monster to Defense Position. When you Ritual Summon a monster, you can banish this card from your Graveyard as 1 of the monsters required for the Ritual Summon.