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 understand why you might think that, Slope Sarg creates really weird play patterns. However when played correctly he really is the reason to play this over vanilla skycrag aggro. Basically you're giving up the turn 1 and 2 swarm you'll usually get from skycrag in exchange for being able to do broken stuff like playing a 4/4 on turn 3 off of champion, or playing thudrock and slope in the same turn on 5 power. Or even on turn 4 if wump stays alive turn 3. Additionally Slope's biggest upside is the hand filtering he gives you. The deck runs 28 power in order to support the 8 5 cost cards, which would just be too clunky in a fast deck like this if you weren't playing Slope to filter extra power out of your hand. Being able to curate your hand for specific matchups or specific board states is an incredibly powerufl effect, it just takes some getting used to. Yetis is my most played deck this past month by a lot and I am still losing a lot of games that I could've won just because the deck is kinda hard to pilot sometimes. Which is why I like it!
(Though I still believe it's a real deck and not really a meme, even if it wants to be.)