Well, the list of things that can go wrong starts to pile up, and its not really worth finding out how youd misstep when theres another player trying to go off across the table
Rare cards can be further classified into regular rare, ultra rare, secret rare, hyper rare, and so on
During the Battle Phase, if you activated this effect this turn, each time an opponent's card effect resolves, this card gains 1000 ATK until the end of the Battle Phase, also it can make a second attack during each Battle Phase this turn
I cant possibly list here all the strategies because I am pretty sure there are 50+ viable decks that you can pilot to a tournament win, so I am including here the ones you are most likely to fight against, either because they are very strong or popular among new players