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I've had a long and rewarding relationship with Cruel Ultimatum, and an even longer one with Mystical Teachings. The combination of the two is pretty epic, with Teachings giving you access to a toolbox of instants whose only purpose is to keep you alive long enough to cast Cruel Ultimatum. Plus, you haven't lived until you've Snapcastered a Cruel Ultimatum.
Despite being based around a seven-mana sorcery and a four-/six-mana instant, the deck has a ton of early interaction. Inquisition of Kozilek and Lightning Bolt give you eight relevant one-drops, and Mana Leak kicks in at two. Snapcaster Mage lets you recur any of the above cards, and even if you get behind, the three Damnations can clean up the mess.
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