D/D/D Dragon King Pendragon

Effect

If this card is in your hand: You can Tribute 1 Dragon monster and 1 other Fiend monster from your hand and/or field; Special Summon this card. Once per turn: You can discard 1 card; this card gains 500 ATK (until the end of this turn), then you can destroy 1 Spell/Trap on the field.