While the card mentions the Sacred Beasts, it's not restricted by that at allwell, for the most part
The most important part of the card is its ability to change its level, as it can increase or decrease its level by 1 once per turn, which allows it to adapt to the other monsters on the board and strategically make XYZ monsters
If you don't have Golden Castle of Stromberg in hand, use Glife or Terraforming to get it, then activate it
Decks Sky Strikers, X-Sabers, and Mitsurugi plus new cards for enhanced gameplay
You can only use each of these effects of "Gashadokuro, the Skeletal Mayakashi" once per turn
Once per turn, if a Monster Card(s) is sent from the field to your opponent's GY by card effect, or a monster is destroyed by battle and sent to your opponent's GY: You can detach 1 material from this card