Cloudian - Nimbusman (SGX3-ENH09) [Speed Duel GX: Duelists of Shadows]

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. If 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.