On average, using its activated ability will put half of your deck into the yard, which should be enough to keep you going for the rest of the game
While it's not great as a Rogue Tribal commander since 1) it doesn't really support Rogue Tribal 2) its "roguejutsu" requires Zareth to be in your hand, not command zone, Zareth is still a great card in the 99 of Anowon, the Ruin Thief since his combat trigger is absolutely brutal, basically a more flexible Ink-Eyes, Servant of Oni trigger
For 4 generic mana, this legendary artifact can immediately draw you a card, and give you protection from everything for one turn cycle
Choose the thunderous beat of Rillaboom V, the speedy fire and quick moves of Cinderace V, or the shifting splashing moves of the clever Inteleon V in the Pokmon TCG: Galar Partners Tin