2 Level 6 monsters Once per turn: You can detach 1 Xyz Material from this card to declare 1 Monster Type; this card gains the following effect. At the start of the Damage Step, if this card battles a monster of a Type that has been declared: Destroy that monster.
Actually yes he can have multiple. If you can refill the Xyz material he can even have more than. Although he can only declare 1 monster type per turn, it does not say that he looses that effect once he gain it.
Basically a Type-specific Super Rush Headlong on a body.