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.
Rulings
Netrep Rulings
"Spirit Ryu's" effect is considered Spell Speed 1, but may be activated multiple times in the same Battle Phase.
"Spirit Ryu's" effect can only be activated in the Battle Step. This is where the attack is declared. Because you can activate multiple chains during this step, as long as you have Dragons in your hand, you can discard them 1 at a time to keep using "Spirit Ryu's" effect. You can't discard, say, 4 in one shot. 1 at a time and your opponent gets the chance to respond/chain. Andrew Roth, 6/21/2005
WIND|
Level 4|[ Dragon / Effect ]
ATK 1000|
DEF 1000