Magic: The Gathering's Commander format is incredibly diverse, allowing players to construct decks of countless archetypes that utilize a myriad of strategies
Assuming you have a sacrifice outlet, Woodfall Primus into Melira, Sylvok Outcast (or anything else that lets Primus come back while eliminating the -1/-1 counter) will dominate a battlefield
On the fair front, Shardless Agent leads to the interesting deckbuilding constraint of playing Blue, but not being able to play Counterspell
That -6 ability will be partially good as green tends to suffer a bit from reliable sources to draw cards
Not only is playing your opponents cards powerful, but it can also be a lot of fun, and it can lead to some really fun stories
1 Junji, The Midnight Sky Is Possibly The Best Of This Set's Spirit Dragons Junji, The Midnight Sky is the black legendary spirit dragon of Kamigawa: Neon Dynasty