This land enters tapped.
{T}: Add {B}.
{1}{B}: This land 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, instead tap it, remove it from combat, and heal all damage on it.)
Spawning Pool has 3 listed printings; the most valuable is the printing from 10E at US$0.38 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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