Therion King Regulus (Secret Rare)

You can target 1 Therion monster or Machine monster in your GY; Special Summon this card from your hand, and if you do, equip that monster to this card. When your opponent activates a card or effect (Quick Effect): You can send 1 Therion Monster Card from your hand or field to the GY; negate that effect. You can only use these effects of Therion King Regulus each once per turn. A Therion monster equipped with this card gains 700 ATK and the previous effect of Therion King Regulus.