1 Viscera Seer
A healthy 55% targets means that you should have a high chance of options and a minimal chance of missing on your Weatherlight cards
As long as Gaea's Liege is attacking, its power and toughness are each equal to the number of Forests defending player controls
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
On this type line, we have a supertype (legendary), a type (creature), and two subtypes (giant and shaman)
Disrupting the flow of time isn't easy to balance in this card game, but it can be done, with the past, present, and future intersecting and mingling in fascinating and powerful ways in all kinds of decks