Cloudian - Nimbusman (Common)

This card cannot be destroyed by battle. If this card is in face-up Defense Position, destroy it. You can Tribute any number of WATER monsters for the Tribute Summon of this card. When this card is Tribute Summoned, place 1 Fog Counter on it for each WATER monster you Tributed. This card gains 500 ATK for each Fog Counter on the field.