Ragnarok, Divine Deliverance looks like a phenomenal dream to live in Limited, and having both these cards at uncommon makes this much more likely to happen than meld pairings we've seen in the past
At time of writing, Phyrexian Arena has had a relatively recent reprint in Phyrexia: All Will Be One, so grab your copies soon because this card sees a lot of play in casual Commander
Young Pyromancer, Shark Typhoon, and Murmuring Mystic are just a few cards that produce tokens for casting non-creature spells
Part of whats so weird about Balance is just how long it took most of the world to realize how broken the card was
You can use that mana to activate Nivix Guildmages looting ability and get a spell like Banefire to kill off your opponent
You can learn more about everything included in boosters with Product Architect Mike Turian's Collecting Innistrad: Crimson Vow article, and be sure to see all the delightful card frames themselves in Clayton Kroh's Booster Fun article