Combined with Archeops, which can get Special Energy onto the field faster, Lugia Vstar could one-shot many other Pokemon while getting rid of Stadium cards
If both sides of the card show wear, the defects add up, and the card should be classified in a lower condition than if only one side had been considered
When you combine that with the marketing gold Charizard, you get a card worth hundreds of dollars
1 oversize card featuring Charizard V
With decks optimized around this strategy, using support cards like Gladion - which allows you to search for both Type: Null and Silvally from the deck - this tactic is surprisingly solid
Be careful you get all the information correct when writing your card listings, be realistic about your cards' quality, and obviously don't try to mislead or trick people