This deck doesn't actually play x4 copies of Rat King. It's just in there as a place holder until EWC is updated with the new Colossal Rodent promo card. The strategy behind this deck is to stall with removal until you get to 4 power, then play chonky 5+ health units that can't die to Saloon Massacre. You should always mulligan to get at least 3 power in your opening hand. Starting with 2 is just asking to get power screwed.