The Winged Dragon of Ra, Sun God of Darkness

Card text

"The Winged Dragon of Ra" + 3 "Sun God" monsters Unaffected by other cards' effects. Once per turn, during the Main Phase (Quick Effect): You can discard any number of "Sun God" cards, then choose that many of your opponent's occupied Main Monster Zones; your opponent must send the monsters in those zones to the GY. When an attack is declared involving this card: You can pay LP so that you only have 1 left; this card gains ATK/DEF equal to the amount of LP paid and the total ATK of all "Sun God" monsters currently in your GY.