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.

The most recent land animating ability takes precedence.

Can sacrifice the Druid to itself.

Only affects Forests that are on the battlefield when the effect resolves.

The land animation ability does not wear off if the land stops being a Forest. It continues until the end of the turn.