Chillin' Outback (SGX2-ENS06) - Speed Duel GX: Midterm Paradox 1st Edition

Once per turn, you can change 1 face-up "Koala" or "Kangaroo" monster's battle position. "Koala" and "Kangaroo" monsters you control can attack while in face-up Defense Position. If they do, apply their DEF for damage calculation.