The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
I am a dozen or so games in, I love this deck. Opponent usually runs everything out not expecting leave behind. I do want to say Jarrel has done absolutely nothing for me, even as a chump blocker. I usually end up plundering him or marketing it.
Couple of games in and I'm with you on Jarral. Not enough spells for him to attack well, and you usually just end up discarding a good card. If you're worried about early aggression or just having things to do before Turn 3, there are a ton of fine early plays for this deck, like Entrancer or Porcelain Mask (for disruption), Alhed Ascending (big 2-cost body), Shifting Illusion or Initiate of the Sands (to help with the power), or Linrei Evangel or Elysian Stranger (for the influence). And I'm not a good deck-builder, so I'm sure I'm missing a much better card for that slot.
I had a games where jarral + spellshaper done great job but overall he feels underwhelming yes. im still brewing around idea tho, since there is RLY LOT to try
Bhodi & Rox Forever Could be a very nice addition or build around for you. Since Leave behind always leaves you one giant and it can fix your power early as well as prevent you from running out of cards in your deck. Happy brewing!
Great deck though, lots of fun!