When you play it, your hand will fill back up to seven cards, but your opponents hand size wont have changed only its contents will be different
[60] Card collecting [edit] Collecting and swapping cards outside of gameplay has been a key aspect of the hobby since the initial release of the Pokmon TCG
Then in your upkeep if you have 20 or more you win that game
Item cards should be used in any deck, but there are some much better than others
Also, opponent's turns will be treated as one long turn for you, so if something says "Until the end of your opponents turn" it'll be the end of that last opponent's turn (does not apply for anything that says "This turn", I'm mainly refering to cards like Swords of Revealing Light)
Im sure smarter people than me will come up with some sort of convoluted KCI-style loop, but for me, Ugin's Nexus is calling, and if you get Feldon of the Third Path online, your options become insane