Edison Format · March 2010
If an effect is chained to the effect of "Sea Koala" that removes every other Beast-Type monster from your side of the field, the effect of "Sea Koala" disappears.
After making the ATK of 1 of your opponent's monsters 0, the ATK of the opponent's monster remains 0 until the End Phase. even if every other Beast-Type monster you control is removed from the field.