Tenth Edition

Spawning Pool

Spawning Pool comes into play tapped.
{T}: Add {B} to your mana pool.
{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.

Spawning Pool enters 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, instead tap it, remove it from combat, and heal all damage on it.)

World Championship Decks 1999

Urza's Legacy

Spawning Pool comes into play tapped.
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T: Add one black mana to your mana pool.
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B Spawning Pool becomes a 1/1 black creature with "oo
B Regenerate this creature" until end of turn. This creature still counts as a land.