I think most peoples' minds will jump to Craterhoof Behemoth, who certainly takes the true crown for Green finishers, but it's wild how ubiquitous Avenger has been since its release
It's better the fatter your Commander is, and with a more traditional slower Commander metagame with a bunch of 5s, 6s and 7s, this is actually feels like a modern Wheel of Fortune that's nicer since folks aren't forced to discard if they don't want to
The sorcery type line may seem like a downside, and it is, but Dragons Rage Channeler appreciates having good sorceries around for delirium
Vampires have these two incredible cards to do that with, and what makes them so good is that they join you permanently , not until end of turn
Bladewing can bring back another Dragon creature from the graveyard straight to the battlefield, a two-for-one deal that Commander players won't usually pass up