Tribe-Infecting Virus — Ruling

Effetto 1

• This effect is an Ignition Effect which activates on the field. (It does not target. To activate this effect, discard 1 card as a cost. Furthermore, declare 1 Monster Type when activating this effect.)
• When this effect resolves, destroy all face-up monsters of the declared Type in either player's Monster Zone. (This effect cannot be activated by declaring a Monster Type that does not exist face-up in a player's Monster Zone.)