If you control more than one legendary creature with the same name and the "legend rule" begins applying again (perhaps because Council of Reeds leaves the battlefield), you'll immediately have to comply with the rule and put all but one of those permanents into the graveyard
This card's variable casting cost allows you to put Angels on the battlefield while holding up mana for counter magic you happen to have in hand, and a single card that can fill your entire board is always a welcome inclusion in a format like Commander
With that said, it is an instant speed non-conditional removal spell so how popular expensive creatures like Lyra Dawnbringer get, as well as how valuable instant speed is, will dictate how much play Murder will see
While it may take a bit to build up to, thanks to Dragon-God only coming in at 4 loyalty, his -8 ability can be an immediate victory if your opponents don't control a legendary creature or planeswalker
Final Fantasy X White-blue-green counters are a classic staple in Magic deckbuilding and having access to all three here really let us build out a whole deck about moving the counters on the board and leveling up your team