All but one of the pieces is in the starting warrior + tribes of the north deck.

1. Jungle Shaman
2. Javelin

Get
1. Savage Shifter

Play the Jungle shaman next to your hero. Then play the Savage Shifter next to the Shaman and play the spore you got from the Jungle Shaman. The Savage Shifter will turn in to the Shaman giving you another spore. This is can be done infinitely and will always give you another spore. Throw your Javelin. Every spore you play will give you a card draw. Once the deck is empty, you'll get your javelin back. Infinite damage on the first turn. Upgrade the javelin until it hits for 4. I recommend not upgrading the Shaman past two. Getting two spores sounds cool, but it is unnecessary and makes your hand look messy. Remove all cards from your deck as you find temples until you always start with those 3 cards in your hand and it becomes a cakewalk.