Okay, Hazezon Tamar has something interesting to say
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If a card is valuable to you, double sleeve it and keep it away from playmats covered in dust or glitter
In fact, he achieved a rare feat: he collected a full set of thirteen warlocks, all of them descended from one of the first thirteen warlocks who made pacts with Asmodeus, the ruler of the Nine Hells
When you have too many cards in your hand, make use of spare Event cards such as "OP11-060 Let's Crash This Wedding!!!" by trashing them for Nami's [On Your Opponent's Attack] effect, similar to a Counter, allowing you to keep your hand size below 7 to activate your Leader effect