Forests you control are 1/1 green Elf creatures that are still lands. , Sacrifice an Elf: Target creature gets +3/+3 until end of turn.
Official Rulings for Ambush Commander
8/1/2008 : A noncreature permanent that turns into a creature can attack, and its abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of his or her most recent turn. It doesn't matter how long the permanent has been a creature.
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