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It is a protective sleeve for inserting cards one by one to protect them from scratches

It taps for mana like normal, but you can also load it with a charge counter and then unleash a the stored-up mana on your next main phase

Sure, you could build a deck to discard your own cards, but honestly, making your opponent discard is far more fun

Indeed, your only issue in getting this deck going will likely be how reliably you can evolve one or more Barbaracles on your field

TCG , which will release on June 3, 2022 (see "'Legendary Duelists S3' Boxes")

Lowers the Barrier to Entry for New Players: A smaller, more recent card pool makes it easier and less expensive for new players to get into competitive play, as they dont need to acquire a vast collection of older, potentially hard-to-find cards