Happy Questing!
And in Black with the Cabal Coffers/Urborg combo you can make tons of mana, and this color combo is rich in card drawing for spells like Ancient Craving and Sign in Blood as well as removal like Bedevil and Chaos Warp to have enough for making the 3/3
However, there are potentially better options available, such as cards that provide more immediate impact or have additional utility
Finally, some typal decks like angels, clerics, cats, vampires, and bats benefit more from lifegain than others
In Commander, where mana values are generally higher, its even more important
Leaving up mana and using the removal spell on a freshly cast creature, especially one with haste, made it so much easier to curve into Desecration Demon or whatever else you wanted to do on turn 4