for a while, youve probably heard of the person who brought a 2,000+ card deck to a tournament since there was no rule signalling a deck limit
If an "Altergeist" Link Monster is Link Summoned to your field, while this card is in your GY (except during the Damage Step): You can add this card to your hand
Lightsworns is a deck that has to mill cards in order to get effects activated, but there is no way for you to control the cards you are milling, and at some point it just feels like gambling
On the field, Performapal Guitartle can even fix your Scales, as it can increase them to make sure you can Pendulum Summon your high-Level Monsters
If you control an "Evil Eye" monster other than "Catoblepas, Familiar of the Evil Eye", while this card is in your GY: You can Special Summon this card, but banish it when it leaves the field
And thats useful, because there are two cards specifically for Yubel in the Duel Academy Box: a backup copy of Advanced Dark , and the Ultimate Crystal monster Rainbow Dark Dragon