You can discard 1 "Plunder Patroll" card, then target 1 Spell/Trap your opponent controls

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Cards like Final Act, Leeches, and Suncleanser can achieve this
This has led to a vibrant economy for Rainbow Charizard GX where the market value fluctuates somewhat frequently based on condition and market trends
An ability that triggers when something becomes the target of a spell or ability resolves before the spell or ability that caused it to trigger
They're a resource that you can use to pay costs, like the ones offered by cards such as T-45 Power Armor