You can only activate this effect during your Battle Step, if this card battles during your turn. Discard 1 Dragon-Type monster from your hand to the Graveyard to increase the ATK and DEF of this card by 1000 points until the End Step.
You guys should REALLY be thinking Outside of the Deck now that your stall glitch has been fixed. Spirit Ryu can STILL put in for 5k Score, even 10k, ON. IT'S. OWN. MERITS. Now put in the work to figure it out, 'coz this card is worth way more than just tiny wall.