+"Land", +regenerate (4)
: Add .
: Regenerate target Elephant.
Spawning Pool enters the battlefield tapped.
: Spawning Pool becomes a 1/1 black Skeleton creature with ": 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.)
: Regenerate target Insect, Rat, Spider, or Squirrel. (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)
, : Regenerate target creature.
Gatherer works better in the Companion app!