You follow all timing rules for spells cast and lands played using the permission granted by Valgavoth's last ability
If the judges rule against you and impose a penalty then you have the right to appeal that decision, so if you feel that it was incorrect then appeal and the head judge will assess the situation and make a final ruling
If one of them resolves, it will remain in effect until Ascendant Spirit leaves the battlefield or a subsequent effect changes its characteristics
The point is to instantly bring out a Melodious from the deck, typically Aria to allow all the Melodious cards to be invincible to destruction by battle or being targeted by card effects
C Common QQ Enneagon X FIRE Level 9 [ DinosaurEffect ] ATK 900 DEF 900 If this card is in your hand or GY: You can reveal 1 Level 9 monster in your hand, except "QQ Enneagon"
Its not great, but its likely a lot closer to Glimmerlight (a great common) than to the useless Bronze Sable