Though it costs a hefty seven mana to cast, since it's often played in a control deck, it is fairly easy to survive long enough to cast it
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Nicol Bolas, the Ravager/Nicol Bolas, the Arisen Nicol Bolas, the Ravager is a new Transform Planeswalker
Ral Zarek is solid for your decks, and I played him in my Standard deck that did some damage at FNMs at the time, as people would really respect Ral in that era, especially with the Double Lightning Bolt available for four mana at -2
A low opportunity cost mana sink that scales into the late-game is awesome, and Ill spoil the fact that the rest of the cycle did not make my list by saying that I believe Lair of the Hydra to be the best of the lot for Cube play
Although there are numerous ways to play and multiple expansion sets you can choose between, I'd recommend grabbing one of the many two-player starter kits if you're new to all this