Giving Paradise Druid hexproof means that your opponents cant immediately take the Druid out before you get a chance to use it
Sevinne, the Chronoclasm Sevinne, the Chronoclasm works well because there are so many synergies surrounding it, like Secrets of the Dead and Torrential Gearhulk
The Power of Goad Monarch was and is a great mechanic
Those release days influence when rotation happens, and thats a two-month window
There are only two Iconic cards in a set, and this time around, Disneys core couple introduces the concept
And that hasnt ended, we just flavor stuff after planeswalkers (Jace's Erasure, Liliana's Specter, Chandra's Ignition) or still after legendary creatures (Ezuri's Predation, Daxos's Torment, Kalemne's Captain, Gisa's Bidding, Geralf's Masterpiece, Oona's Grace, etc)