Card Rulings:Tribe-Infecting Virus


 * You declare the Type when you activate the effect and discard for the cost, not when the effect resolves, so your opponent can chain after you have announced which Type will be destroyed.


 * You CAN declare a Type that exists only on your opponent's side of the field. You CANNOT declare a Type that is not face-up on the field at all.


 * You can use this effect repeatedly as long as you can keep paying the cost.