Anytime any creature dies, yours or your opponents, you get to drain two life from an opponent and heal yourself two, putting some heavy pressure on your opponents
Since all of our creatures except for Hinterland Sanctifier are legendary, if we can get some counters on Aerith and then have it die (which we can do by playing a second copy thanks to the legend rule), our team will get massive, maybe big enough to win with just one attack
It has some interesting spikes with cards like Flame Rift and Fiery Confluence that other spellslinger commanders dont, but its mostly more of the same
Credit: Wizards of the Coast Trostani, Three Whispers BPhillipYork : Giving up double strike that easily is fairly dangerous, a lot of creatures can do bonkers things with double strike, and having deathtouch on command also makes it super dangerous to block even weenies
Any "as [this creature] enters" or "[this creature] enters with" abilities of the copied commander will also work