GX Pokmon were first introduced in the Sun and Moon series
It might seem like there are endless new card types being released for the sake of variety, but most foil types are still quite valuable if found on the right card
You can go the value route with something like Combustible Gearhulk, the combat route with Combat Celebrant and Fear of Missing Out, or the get everyone dead route with a damage-based ETB creature like Overlord of the Boilerbilges or Inferno Titan
Given how much Wizards seems to be enjoying using DFCs and MDFCs in Universes Beyond sets, this could well happen sooner rather than later
When an opponent draws except for their normal draw step, you get a 1/1 green Snake creature token
Ojer Axonil, Deepest Might / Temple of Power Listed at: $12 Ojer Axonil, Deepest Might thrives in red decks that feature instant and sorcery spells