Spawning Pool enters the battlefield tapped. {T}: Add {B}. {1}{B}: Spawning Pool becomes a 1/1 black Skeleton creature with "{B}: Regenerate this creature" until end of turn. It's still a land. (If it regenerates, the next time it would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)
![Spawning Pool (Premium Foil) [Tenth Edition] MTG Single Magic: The Gathering | Multizone: Comics And Games](http://multizone.ca/cdn/shop/products/eb877107-c067-5a83-a31b-20fbbd9546bf_385ef674-b64c-47d8-8227-ad9d9a610831.jpg?v=1715935631)
