Katara's Necklace is a Weiß Schwarz card from [TD] Avatar: The Last Airbender ATLA/WX04-T18. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Put the top 2 cards of your deck into your waiting room, choose up to 1 level X or lower 《World of Avatar》 character in your waiting room, and return it to your hand. X is equal to the total level of the cards put into your waiting room by this effect. (Climax are regarded as level 0)