That's the crux of the issue, though, as you generally want to be rid of the thing, but sometimes exiling it temporarily is good enough, and if you want a more permanent-heavy focus, this can be used to replace an instant
Well, let's talk about Archenemy
Heck, even if it coaxes out that Swords to Plowshares (and you don't get the Treasures because the Hydra is Exiled), now you can cast something else and know that stupid Swords is used up
Self-mill is another way to do it
Facilier, Agent Provocateur is even better when paired with certain other cards
At the end of every turn, put 1 damage counter on the Pokemon Darkness Energy is attached to, unless it's D or has Dark in its name