GX, Jaden has been transformed by the Gentle Darkness into the monstrous Supreme King, he's killed most of his friends, and the majority of the surviving heroes are either too weak to do anything about the crisis at hand, out of commission, or not exactly upstanding figures themselves
Fun fact: Its body stores delicious juice that trainers say tastes just like apple cider
These include the normal summon/set of one monster (in face-up attack position or face-down defense position respectively), any special summons you are allowed, the activation/setting of spells and traps, and changing battle positions of your monsters, including flip-summoning facedown defending monsters into the face-up attack position
Standard Holo Many new collectors confuse these two types: Standard Holo: The artwork of the Pokmon shines, but the text box is plain
Doomsday Excruciator is one of the first cards to be revealed for Duskmourn, and this black-mana demon makes an incredibly strong first impression