
All lands become 2/2 creatures until end of turn. They're still lands.
As long as the dryads are a part of the forest, the forest is a part of the army.
Illustrated by Pete Venters · Ninth Edition · #256
2008-08-01
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.