Decks like Legacy Infect, Modern Infect, and countless EDH decks all use this powerful mechanic to dispatch their opponents
Not only was the mechanic very much fixed from how it was used before, but it also helped your deck fix its colors
3 Gargos, Vicious Watcher While Omnath is all about mana, Gargos, Vicious Watcher, is all about massive Creatures, specifically Hydras
Modality while not a quality shared by all top commanders, what can be a major strength for many is their versatility, enabling you to do whatever the situation requires
Anything that takes out an opposing threat is nice, as are looting/card draw triggers or those which chain into further reanimation these are effects we need all the time anyway, and the more we can overlap them with this other core function of huge deadly attacker, the more consistent we will be