Having two power naturally means youll need to buff this one way or another, and I think the best way to do that is with Cultist of the Absolute
It even offers modality as a double Regrowth of sorts, which is an awesome buyout when you're not using the first mode
Hand Size Matters Since you draw a bunch of cards you also need to pay attention to your hand size
Even if this commander is countered, you still get to exile half of one of your opponents libraries
Remember that ring-bearers become legendary, so you can recruit a non-legendary creature to add to the count
Masters of Evil Commander (1) Creature (30) Clockwork Droid Cyberman Patrol Cybermat The Master, Formed Anew Dalek Squadron The Cyber-Controller Vashta Nerada Weeping Angel Zygon Infiltrator Ashad, the Lone Cyberman Cult of Skaro Renegade Silent Solemn Simulacrum Sycorax Commander The Beast, Deathless Prince The Flood of Mars The Master, Gallifrey's End The Master, Mesmerist The Rani Vislor Turlough Dalek Drone Rassilon, the War President Sontaran General The Valeyard Time Reaper Auton Soldier Missy The Master, Multiplied Cybermen Squadron The Dalek Emperor Instant (4) Cyber Conversion Feed the Swarm Snuff Out This Is How It Ends Sorcery (8) Doomsday Confluence Delete Don't Blink Exterminate