Shes a four mana Black and Green 2/2 that lets you gain two life whenever you sacrifice a Green Creature, and lets you pay two life when you sacrifice a Black Creature, and if you do, your opponents have to sacrifice a Creature too
Most Commander players shy away from aggro, but with cards like Winota, Joiner of Forces and Caesar, Legion's Emperor it's more likely you'll run into go-wide threats
Plus, Karador and other leaders that are hard to stop outside of graveyard silencing (The cheaper to play cost, the ability to recur one creature per turn for free) also forces graveyard-centric decks that are just nice and not abusive to have serious issues
It really shines alongside token generators or cheap merfolk to quickly rack up those triggers
Aphelia, Viper Whisperer This two-drop deathtouch legendary mono-Black with a 1/3 size is next