black and green mtg cards Ikoria Green/blue Mutate - 60

With the prevalence of powerful activated abilities in Commander, Sheldon Menery himself called it a necessary card for Commander and ranked it as one of the top 20 cards for Commander in Modern Horizons 2 when it received a much-needed reprint there

The Assassin is a Dimir flashable 3/3 that enters the battlefield tapped as a Clone of any dork and then can destroy it like an six-mana Ravenous Chupacabra that leaves behind a tapped Clone of that dork you just killed and can serve as a Clone of your key dork instead if that is how the battlefield plays out

It also pairs naturally with many best Commander staples built around creature density

White might not be the most powerful at drawing cards, but in a world of Rhystic Studies, it might be the fairest