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
Players can spend four Ink to play this card as normal or Exert any character with a cost of four or more to sing it for free
Elesh Norn used Nissa to control Realmbreaker and open Omenpaths
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