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.
First, that we didn't find them necessary during testing on stream last night. Second, that you'll notice merchants left out of almost all of my aggro decks because the bodies simply don't justify the card slot for anything but tournaments (and even then, very rarely.) We seem to win more matches by high density of things we need rather than access to a single thing we need situationally. I'd guess this deck could use them more than the vast majority, though, because it pushes more into midrange—so we may experiment with that in the future.
Edit: Some decks need high density to increase the odds of hitting one of a key card. Aggro decks tend to need high density to increase the odds of hitting many copies of cards you need, in case the distinction was unclear.
Edit: Some decks need high density to increase the odds of hitting one of a key card. Aggro decks tend to need high density to increase the odds of hitting many copies of cards you need, in case the distinction was unclear.