I don't imagine you'll be doing this very often, but maybe you're out of Lessons, so you planned to discard, but some things happened in response, and one thing led to another, and now it's time to learn, but you have an empty hand, and this is all very embarrassing, and let's just not speak of it again, okay
Its fair to see that most people have found at least one of these to be to their tastes now, and the most recent releases - basically all of the ones named above - have ranged in quality from being very good to exceptional, making the concept a pretty resounding success
There are very few ways to actually lose energy counters outside of spending them, but it is possible with stray cards like Suncleanser and Final Act
Some people buy expensive wines, some like fancy cars, but me, I buy unopened vintage Magic card booster packs