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You can play it when theres one opposing creature, and then the creature will die at the start of your opponents turn

No, backgrounds have an enchantment subtype that is separate from auras, and they do not inherently target or attach to a creature the way auras do

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A use for the last option would be starting with Lumineon V, using Ultra Ball [Scarlet and Violet] to discard a Lugia V [Silver Tempest], use Thorton to bring it back, and Evolve into Lugia VSTAR (if you waited a turn to Evolve)

Activated abilities with certain mana symbols dont affect this mechanic