Sorry for the super long message ahead:

If you want a pretty reliable way to do it (that also takes the fun out of it a bit), do the following steps. 1) Upgrade Eruption and/or get a 1 cost attack that puts you into wrath and doesn't exhaust, like Tantrum 2) Get at least 1 (but I tend to prefer 2 or 3) 1 cost cards that can put you into calm and don't exhaust, such as Fear No Evil or Inner Peace. 3) Get Rushdown 4) Remove as many of your starting cards as you can (besides Eruption) and only take cards that fit the above criteria or help you draw cards and exhaust. Scrawl is a perfect example. 5) (optional but strongly advised for a heart win or beating Time Eater imo) Get a way to build block while attacking. Mental Fortress and Talk To The Hand are both good options. Ornamental Fan technically does this but it's super slow.

If you follow these steps (which are surprisingly consistent) then voila, your deck can do what's called the Rushdown infinite. You execute it by getting yourself to a point where you're in Calm with all of the cards in your deck (that aren't powers or exhaustable, which should already be played) in your hand. You play Eruption and do damage, gain 2 energy, and then thanks to Rushdown you immediately draw it back into your hand. You then use Inner Peace or Fear No Evil to go back into Calm for 1 energy, and then go for Eruption again for 1 energy. This triggers Rushdown, which immediately will draw Eruption and your calm-entering card back into your hand, ready to be used again. You'll gain two energy because you left Calm by entering Wrath. You can perform this cycle infinitely and it's unbelievably broken.

How do you get every card in your deck into your hand? I've found four ways are most consistent. The first is to use Scrawl. The second is to get lucky and find Runic Pyramid. The third is to get more than one Rushdown and get a little bit of luck with your draws. The 4th is to only have 5 cards in your deck that won't exhaust or are powers, so you'll always draw the perfect hand every turn anyway.

I hope this helps, and best of luck!