Cloudian - Acid Cloud

[ Fairy / Effect ] This card cannot be destroyed by battle. If this card is in face-up Defense Position, destroy it. When you Normal Summon this card, place 1 Fog Counter on it for each "Cloudian" monster on the field. You can remove 2 Fog Counters from this card to destroy 1 Spell or Trap Card. ATK/ 500 DEF/ 0