Broodmate Dragon is very good at these tasks, because you get not one but two independent good creatures capable of dominating many boards on their own
I'd cut the following: Vega, the Watcher, Tasha, the Witch Queen, Mind's Dilation, Celestial Dawn, Lighthouse Chronologist, Restore Balance, Xanathar, Guild Kingpin, Dromar's Charm & Talent of the Telepath
koma, comsos serpent Jamie: 10/10 bomb bomb bomb
What Mechanics Use the Exile Zone Naturally
I have brought back a key fetch land to crack open another color of mana in my Five Color Cromat Commander deck
Steel Overseer pairs especially well wit h Unwinding Clock, since you can use its effect four times in a full turn cycle, giving four +1/+1 counters to all your creatures by the time your next turn starts