How does duplicate protection work for Jumpstart packets
Three thousand years ago, ATEM, unable to defeat the Dark High Priest by his own power, sealed both his own soul and the Dark High Priest (changed to Zorc Necrophades in the anime adaptation) within darkness and erased his own name
They mutate into the creature on top plus all abilities from under it.) Trample Whenever this creature deals combat damage to a player, return target creature card with mutate from your graveyard to your hand
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Additionally, I tried to make it work for whenever the game ended, but it tended not to work with multiplayer situations