Played in the right decks, it can give you an infinite number of extra turns, steal everything your opponents control, and lock them out for the rest of the game, but there is one caveat: your opponents decide how well it goes
Duel Masters had double-faced cards where we printed a card on both sides
I've never got one myself, but there's plenty of videos floating around online of trainers pulling banger after banger
See Lava Spike, Molten Rain, and Past in Flames: Whether or not the illustrations are physical paint on canvas or pixels on a computer, a fireball just feels right within these confines
On PC/Mac, look to the bottom left for a green + icon
Avoid deals that seem too good to be true, as counterfeit cards are common