Advanced format ruling
Spirit Ryu
Card effect (current official text)During your Battle Step, if this card battles (Quick Effect): You can discard 1 Dragon monster to the GY; this card gains 1000 ATK/DEF until the end of the 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.