There is shroud equipment, and, in fact, it is remarkably powerful
Eternatus, Bringer of Darkness Dragon/Xyz/Effect/DARK/Rank 4 ATK 2600/DEF 2400 3 Level 4 monsters While this card has materials, it is unaffected by the effects of other monsters, except LIGHT monsters
Although the value of the additional action is high, the engagement action has a very limited use, only pulling in an enemy that is engaged with an ally or catching an apathetic enemy, and because it uses up an accessory slot that is very valuable to the guardian, this card is not evaluated very well
You can also spend two to sac this to counter an ability as an emergency like the win-clause of Thassa's Oracle
The effect is sober and the RBI does not reach the lower attacker line, so it will not fit in a normal Dragon Deck
And really, isn't that what gold cards are supposed to do