Forbidding Watchtower

Forbidding Watchtower enters tapped.
{T}: Add {W}.
{1}{W}: Forbidding Watchtower becomes a 1/5 white Soldier creature until end of turn. It's still a land.

The List

Duel Decks: Mirrodin Pure vs. New Phyrexia

Tenth Edition

Forbidding Watchtower comes into play tapped.
{T}: Add {W} to your mana pool.
{1}{W}: Forbidding Watchtower becomes a 1/5 white Soldier creature until end of turn. It's still a land.

Urza's Legacy

Forbidding Watchtower comes into play tapped.
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T: Add one white mana to your mana pool.
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W Forbidding Watchtower becomes a 1/5 white creature until end of turn. This creature still counts as a land.

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.

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.