Boosting your team with +1/+0 means your creatures always swing above their weight class, and every time one dies, Judith gets to ping any target
I especially like how closely Living Energy hews to the original feeling and gameplay goals of the first Temur Energy decks in Standard
Id love to pay for the chance to give my opponent a 3/3 (Ogre)
If at least one target is still legal, the ability will resolve but will have no effect on any illegal targets
For example, if you control Maskwood Nexus and an effect says that each Warrior you control enters the battlefield with an additional +1/+1 counter on it, any creature that enters the battlefield under your control will get that counter
So, there are political, financial, moral and even competitive reasons you might not want to go all the way in on wheel effects