Many Zombie monsters have effects that implicitly relate them to "Zombie World", usually involving affecting the opponent's Zombie monsters on their field or in their GY, which "Zombie World" can set up
Going second, you will most likely be dealing with Baronne, Grand Master, and a set Blackout
They were both developed by Wizards of the Coast for a time, but they've been different from the start
Its maybe the worlds most complex game ever made (with almost 20.000 unique cards printed), but they managed to split their development and design to both very enfranchised players and new ones, making the game still interesting for long time fans and accessible to anyone who is trying to become a player
With Kitt in play, you can tap two creatures during each players combat step to give a creature +2/+2, trample, and make it goaded until end of turn
(1) If this card was activated this turn: You can add 1 Destiny HERO monster, or 1 card that mentions a Destiny HERO monsters card name, from your Deck to your hand