Having access to both in just one half of your Commander is ridiculous
One of the most powerful commons coming out of Modern Horizons 3 it allows you to cast spells from exile, as well as make Spawns, which is a form of ramp
You can only have four copies of a card in a deck, but sometimes, that is too much
Teval, the Balanced Scale Teval, the Balanced Scale has a little evasion so it's a good chance you'll want to attack every turn with it
Red lets you give all Creatures trample and haste until end of turn, Green lets you put a +1/+1 counter on a Creature, White allows you to give a play five life, Blue makes a player draw a card, and Black resurrects a Creature from its owners graveyard
After somewhat randomly getting back into magic after college, inevitably I ended up painting one of my cards...then another...then another