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.
It has been great against anything that isn't fire aggro. Against fire aggro I would rather play finest hour. Just make sure to use the counter before the late game stage sets in, even just countering some card draw is better than letting it rot in hand if the game ever goes into 7 power vs a rule deck for example.