Hildibrand's adventure fits the requirement, and being an instant means it gets you closer to triggering Y'shtola on other players' turns (Y'shtola triggers on everyone's end step)
In Set Boosters, you had the potential to get up to 6 commons, but that came at the cost of not getting additional uncommons, rares, and mythic rares
Mana rocks like this are uncommon, being so aggressively costed for so generous an effect, and Sol Ring has long since established itself as a Commander format must-have
They are "A Commander deck can have two cards named Mothers Yamazaki" and "You can designate two cards named Mothers Yamazaki as your commanders." Both commanders start in the command zone, and the remaining 98 cards (or 58 cards in a Commander Draft game) of your deck are shuffled to become your library
But I can confidently say that I enjoyed playing
You can also get copies of Damn, Bloodline Necromancer, Cordial Vampire, Elenda, the Dusk Rose and plenty of other decent rares