
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 4 printings, first in Urza's Legacy (1999). EDHREC ranks it #15,058 among Commander cards. It appears most in The Infamous Cruelclaw decks (584 on EDHREC). It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.