Advanced format ruling
Rallis the Star Bird
Card effect (current official text)This card gains ATK equal to the Level of the monster that it battles x 200 during the Damage Step only. If this card attacks, it is removed from play at the end of the Damage Step and returned to your side of the field in face-up Attack Position at the beginning of your next turn's Battle Phase.
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.