Since cycling generally costs one or two mana, no matter what cycling creature you end up hitting with Unpredictable Cyclone, you'll come out way ahead in terms of mana, paying two for a four-, five-, or even seven-drop, which sort of puts Unpredictable Cyclone into the Wilderness Reclamation / Fires of Invention category of absurdly powerful ramp spells that only work in fairly specific decks
The ability triggers as soon as a spell is considered cast that is after it is paid for
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If you've been wanting a copy of Precursor Golem or Ramos, Dragon Engine, now's your chance
Moreover, while Grafdiggers Cage wont be the only graveyard hate, it is set to be the premier graveyard hate after Nihil Spellbomb and Surgical Extraction rotate