You can spend the gift card on a second game or Xbox accessories sold at Dell.com.
Brad's Deals Editor Michael,
Get an Xbox One X together with the State of Decay 2 game for $499.33 with free shipping at Dell. The included games already saves you $29.99 and makes this the best offer we could find for an Xbox One X, but Dell is also including a $50 e-gift card on top of that. You can spend the gift card on anything sold at Dell.com, including accessories and games for the Xbox One X. Sales tax is charged in most states.