They let you grab exactly what you need fast, whether its a combo piece, a clutch answer, or protection for your win turn
Having a second Volo when your Mirror Image original (not the copy) enters won't do anything because it's not being cast, it's entering the battlefield
Understandably, this is frustrating for long-term collectors, who are watching The Pokemon Company struggle with this increased demand
Start with the Altar, to sacrifice Ozox for 2 mana and get a treasure
2 Heliod, the Sun-Crowned and Walking Ballista One of the most popular win conditions in a mono-white Commander deck is the combo of Heliod, Sun-Crowned and Walking Ballista
It's a lot of versatility in one card, and here your mana isn't being taxed, just the speed