A few tips before I get to the easy tutorial: Unless your leather is extremely thin, you will want a leather needle
If this card in its owner's possession is destroyed by an opponent's card: You can add 1 Beast, Beast-Warrior, Winged Beast, Insect, or Plant monster from your Deck to your hand, except "Kittytail, Mystical Beast of the Forest"
I would not be surprised if Charizard, Blastoise and Venusaur are all among the rarer (H6) holos just like in Base Set unlimited
A player can have any number of pokemon stored away, and only three in the game
Since it costs three mana and suspends with three time counters, you generally wont be able to cast Inevitable Betrayal until turn six in most cases, but thats still fine depending on which card you get from your opponent