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You can manage & track your card collection and decks once you create an account and login.
You CAN play Supercharge off of OPBL (or via Leap of Faith), but it probably wont do what you want it to do. It does give Bold 3, but because battle cards have already been flipped for this attack, that Bold 3 wont do anything. But you could still play it. You know, for fun.
However, if the character you give Bold 3 to gets to attack later in the same turn, that Bold 3 will be in effect.