Forced: When this legend enters play, you must burn 3 zones instead of 2 in order to win for the rest of the game. Action: When this legend attacks, turn target development you control faceup. If it is a [High Elf] unit with Ambush, trigger its ability as if it just ambushed and declare it as an attacker. Otherwise, sacrifice it.
Is the unit I turn faceup able to attack from any zone, or must it be in my battlefield in order to not create an illegal state?