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Your cards in your TCG Live account have no value for that matter, your TCGO cards had no value either, outside of its in-game economy

But even if they do, additional disruption options are easily accessible such as Lost Sanctuary (YGOrg Translation) to negate monster effects, Divine Punishment to negate any activation, The Executor of Hades Pluto (YGOrg Translation) to flip monsters facedown and these are just the on-theme options

Mimic Vat Mimic Vat is a highly popular imprint card that has seen many reprints in Commander sets since its original printing in Scars of Mirrodin

You'll need the basic Pokmon in play before you can evolve it into Jolteon

If a lot of the light bleeds through revealing some design elements, you likely have a genuine card

Also I think it is very important to show some examples for variances to avoid over paranoid reactions