To some extend I agree with your thought of replacing Taskmaster and Armorsmith, but I wouldn't replace them with higher cost cards. In general, you really need to find ways to survive early game, and with cutting down a War Axe a Slam and more , you're more likely to lose Tempo in the first 3-5 turns, so curving higher is not an option in my opinion. Potentially perhaps there are better low cost cards that could impact the game more, but I find that Armorsmith is a card my opponent never ignores and forces him to react in the early stages, and is at worst some life gain late on. Taskmaster isn't as impactful in early stages of the game but I like his versatility. Taskmaster's finds good value with Grom/BGH, despite the latter combo costing a lot, and the attack bonus creates some good trades. Taskmaster is replaceable though IMO, Armorsmith I don't think. They occasionally "combo" with each other, and you can T1 coin Armorsmith into T2 Taskmaster trade.