Beginning as a very reasonable 3/3 trampler for three, Slogurk grows in power whenever a land goes to your graveyard from anywhere, be it a self-mill effect or a fetchland sacrifice
Id love to talk more about the plane itself, or maybe delve into Theros Dungeons and Dragons crossover
Also keep in mind that you can cast your opponents' instants with this card as well, not just your own, greatly expanding the value you can get from Volute
We were not treated to such things often and so any half decent dual was a lock in
(Technically, the Kaladesh booster pack says the ratio is 1:2,160 cards.) This is slightly more often than opening a premium mythic rare
In the first Commander product, it signaled that our friends in Studio X (called R&D at the time) were not just willing to design with the format in mind, but specifically targeting parts of the game which meant something only to us