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Another user posted that they got a Snapcaster Mage as the bonus card for the Hatsune Miku drop this one featuring new anime art and a name of Encore Electromancer

Agathas Soul Cauldron offers a combination of making your abilities costs generic, negating opponents recursion, buffing creatures, and building up a stack of abilities across your board

Since a deck like this can Normal Summon a big attacker and make multiple Special Summons in a single turn, it can quickly press through a single Warning or Dimensional Prison

Do note that it's legendary card not permanent, so the Captain can even go find legendary sorceries, like Karn's Temporal Sundering or Yawgmoth's Vile Offering