So I'm starting to enjoy the game more and was wondering if you guys could share some knowledge my way.
4. For anyone that plays Magic: The Gathering, is there anything comparable to Blue or Black decks?
Thanks for any and all help. I really want Priest to be viable but I'd prefer a Horde Priest. Anduin is such a dork.
To answer your question, it depends on which black/blue you're going for.
I personally play a black vampire/zombie deck based around sacrifice (Undying benefits, Butcher of Malakir, Harvester of Souls, Anowan the ruin sage, etc), and my hunter deck reflects that kind of playstyle (expend the hounds, using cards like Cult leader and Flesheating ghoul alongside the hyenas and expendable "unleash the hounds"). They achieve different results: the magic deck revolves around constant control and slow leeching, while the hunter deck focuses on a huge ramp up and combo-based finish, but they follow the same premise.
Other black decks that come to mind are the Lilana's Embrace/Megrim decks (mill and abuse) and infect, and for the first one theres may become something to that sort coming soon with druid, while the other one is a bit more unique and really not replicated in HS.
As for blue, pretty much secret mage deck fits the bill of at least half of all blue decks, with the other set (evolve/island walker and relic smash) not really existing as of yet. Evolve may come into some kind of a way with undertaker and a deathrattle deck, and shade/grull, but otherwise theres really not much to match it.