These are alternate art cards.
This special, limited edition promo pack is only be available at five events in 2024: San Diego Comic Con, Gen Con, Spiel, PAX West, and PAX Unplugged. It contains six promo cards with a brand-new, exclusive visual treatment. All six cards are unit cards featuring prominent wielders of the Dark Side of the Force.
From Spark of Rebellion:
Count Dooku, Darth Tyranus (2024 Convention Exclusive, 1)
Darth Vader, Commanding the First Legion (2024 Convention Exclusive, 2)
Emperor Palpatine, Master of the Dark Side (2024 Convention Exclusive, 3)
From Shadows of the Galaxy:
Kylo Ren, Killing the Past (2024 Convention Exclusive, 4)
From Twilight of the Republic:
Asajj Ventress, Count Dooku's Assassin (2024 Convention Exclusive, 5)
Darth Maul, Revenge At Last (2024 Convention Exclusive, 6)