The biggest drawback of this approach is the mana, and lands that produce all five colors come at a much higher premium in Najeela than they do in the three- and four-color decks because you have a wide variety of the most powerful spells across all five colors you want to cast, and you still need access to all five colors to execute the Derevi combo
Instead, it's a rather safe release in terms of mechanics, but offers a great range of products, covering casual, competitive, and co-op play, something that should be the minimum expectation, but hasn't always been the case with releases since
, Sacrifice Zack Fair: Target creature you control gains indestructible until end of turn
I think Endless One could be fine in a deck that has a focus on the +1/+1 counters on your creatures with cards like Avatar of the Resolute, but as a big payoff spell, the other options are miles better
Sygg, River Cutthroat Sygg, River Cutthroat is a decent commander for either rogues or merfolk
If not the equipment itself then all the good support cards for it instead