Cloudian - Acid Cloud (SGX3-ENH03) [Speed Duel GX: Duelists of Shadows]

Cannot be destroyed by battle. If this card is in face-up Defense Position, destroy it. If this card is Normal Summoned: Place 1 Fog Counter on it for each "Cloudian" monster on the field. You can remove 2 Fog Counters from this card, then target 1 Spell/Trap on the field; destroy that target.