Advanced format ruling
Cloudian - Storm Dragon
Card effect (current official text)This card cannot be Normal Summoned or Set. This card can only be Special Summoned by removing from play 1 "Cloudian" monster from your Graveyard. This card cannot be destroyed by battle. If this card is in face-up Defense Position, destroy it. Once per turn, you can place 1 Fog Counter on 1 monster on the field.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.