Devourer of Destiny has a unique package of abilities and offers an additional scry-like effect if drawn as part of the opening hand
Hour of Devastation deals 5 damage to each creature and each non-Bolas planeswalker
Playing large creatures early with cards like Reanimate and Sneak Attack is already a strategy in Commander, so having a commander that can do the same with a unique mechanic is exciting
This humble gobbo can copy your best creature for a turn, letting you benefit from ETB and sacrifice effects, or just swing in with a temporary chunky beast
Toph, the Blind Bandit If Earthbending is a strategy you're interested in, Toph, the Blind Bandit can be a very powerful creature for a cheap casting cost
Of course, Bibarel cant be overlooked