Also, if you have no cards in hand when it resolves, you simply draw a card
That said, Possibility Storm was mostly unplayable from a competitive perspective because the deck-building cost was too high, until the right support mechanic (adventure sorceries) came along and made it into the centerpiece of a legitimate deck, so it might just be a matter of time until something breaks Unpredictable Cyclone as well
This used to be different, but Magic fans found a way to exploit the rules, allowing costly, powerful spells like Tibalt, Cosmic Impostor, to be played for free
Once you've got an idea of the best MTG mana ramp cards, you might also want to check out the best MTG commanders, and the top MTG planeswalkers, to continue building up your deck
It'll either be an archetypal staple or see no play whatsoever and there's likely not much potential in between
These are all true of the card and stop him from being a real power house or a mainstay in any archetype but they are not sufficient to render him unworthy of an A cube slot