Oracle

Land 

Spawning Pool enters the battlefield tapped.
T: Add B.
1B: 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.)

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

8/1/2008
A noncreature permanent that turns into a creature can attack, and its T abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn’t matter how long the permanent has been a creature.

10/1/2009
Activating the ability that turns it into a creature while it’s already a creature will override any effects that set its power and/or toughness to a specific number. However, any effect that raises or lowers power and/or toughness (such as the effect created by Giant Growth, Glorious Anthem, or a +1/+1 counter) will continue to apply.

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