This is important, as whenever Nethroi mutates, its controller can return any number of creature cards with total power 10 or less from their graveyard directly to the battlefield.This can bring back a massive board state from the graveyard with the effect of a single card, potentially swinging the game in its controller's favor
Maybe once every five years, they turn up
Urabrask the Hidden Here we have the most sympathetic Praetor, Urabrask the Hidden
Dark Magic Mirror Force X TRAP When an opponent's monster declares an attack, or an opponent's monster effect is activated that would destroy a monster(s) on the field, while a monster that mentions "Shining Sarcophagus" is on the field: Destroy as many Attack Position monsters your opponent controls as possible, then if you control "Dark Magician", inflict 500 damage to your opponent for each monster destroyed, also for the rest of this turn after this card resolves, the first time each monster you control that mentions "Shining Sarcophagus" would be destroyed by battle or card effect, it is not destroyed
They are easy additions to Commander brews