This was done to refocus development on the production of the game
That means you lose that creature the turn you put this Aura onto the battlefield, and then lose it for the next four turns as well (three turns to remove the counters, and one to sacrifice the Cocoon the creature is still tapped that turn)
I am a bit worried Explore is generally overrated because it was good in its Standard, but that was a particularly weak Standard so we might have an overly rosy view of it
their additional effects simply wont do anything
With that final ability, you can spin the top of your library and cast cards for free, which makes this a powerful value engine, win condition, and mana source all in one
Syr Ginger, the Meal Ender has been high on my list, but we already have one in the group, so instead I think this is the obvious choice