Therion Irregular - 25th Anniversary Tin: Dueling Heroes Mega Pack (MP23)

You can target up to 3 "Therion" monsters in your GY; Special Summon this card from your hand, and if you do, equip them to this card. You can discard 1 "Endless Engine Argyro System"; destroy all cards your opponent controls. While this card is equipped to a monster: You can Special Summon this card, then equip the monster this card was equipped to, to this card. You can only use each effect of "Therion Irregular" once per turn.