Star-Aligner Druid is a Tier 1 Deck in Wild at the moment. And it works so well entirely because of Juicy Psychomelon.
I don’t mind combo decks, because usually they take a bit to set up and you can rush them down in the meantime. But Star-Aligner Druid has none of that weakness. They can’t be rushed down, due to ridiculous armor gain and Spreading Plague. They don’t take a while to set up, because they draw exactly what they need for just 4 Mana.
It doesn’t see much play in Standard, mostly because their win condition still relies on cards outside of the ones drawn by Psychomelon. Melon will still draw you C’Thun, Maly, Togwaggle, Florist/Azalina (the usual suspects for Combo Druid), but you still need to have the burn in hand/be close to deck out to complete the win.
The Wild version doesn’t have that weakness. It draws you every piece you need, and you simply need to play them the following turn (or whenever you hit 10 Mana, which considering its Druid...)