There are no other drawbacks and nothing more to it
Black & White Note: Each Booster Code gives you 5 random cards from this incredible set
Choose your cards wisely as you create your Deck for the event, and let this article help out with ideas
Judgment of the Lights Synchro Monsters cover a wide variety of Levels giving you tons of choices when you construct your Extra Deck
This card reads "Once per Chain, during the Main Phase, if a "Mimighoul" monster your opponent controls is flipped face-up: You can randomly choose 1 face-down card in your opponent's Extra Deck, and if it is a monster that can be Special Summoned, Special Summon it to your field, but it cannot activate its effects this turn
Or, alternatively, be like 10-year-old me and throw away two full binders of Southern Islands only to see how much theyre worth 20 years later.