When your opponent activates a card or effect on the field, if you have 3 or more different Monster Types on your field (Quick Effect): You can negate the activation, and if you do, destroy that card
Keep a cheat sheet on hand to help you as you play
Rarities with an asterisk(*) after them will also trigger Secret Packs
Crystron is an archetype that can often be confusing to many players, generally because they can act on their opponent's turn, and they can do a lot of setup that ends on a seemingly-underwhelming board
Landfall Whenever a land you control enters, create a 4/4 red Dragon creature token with flying
You'll still be able to do local custom duels with someone in the same house as you, but local custom duels will be handled slightly differently, as will saving