While it is expensive and somewhat slow, if you can untap with it on the battlefield and a grip full of cycling cards, the game should quickly get out of hand, despite the randomness inherent in Unpredictable Cyclone
Elemental Blasts + Hydro/Pyroblast Blue Elemental Blast, Hydroblast, and Null Elemental Blast are a few of the best color-hoser cards in the game
This does not count creature types exclusive to Un-sets
If your goal is to attack often you can look for commanders like Isshin, Two Heavens as One and attack triggering cards like Inti, Seneschal of the Sun, Hellrider, and Beastmaster Ascension
While Drain Life only lets you target a single player, you can switch it out for cards like Exsanguinate or Debt to the Deathless, which can make all of your opponents lose life