The jump in prices come down to scarcity, grading and a surge of deep-pocketed buyers chasing a limited supply of top-tier assets
In other words, this Lesson has been seeing play because of several different kinds of decks, whether that be life gain, Aristocrats, or Token Storm
If you manage to do so, Espeon will devolve all of your opponents Pokmon by one level, potentially knocking them out in the process if they have more damage counters than their new HP cap
Even giving your opponent choices as to what they lose still has a significant disruptive effect most of the time
If I were to pick one interaction that makes me excited, [casthaven]Ventifact Bottle[/casthaven] and [casthaven]Lux Cannon[/casthaven] would be it
These 5/5s can be a copy of any permanent, and hit like a truck