Which level 1 monster do you like the most in Heroes of Might and Magic V?

In a crucial battle, when there are enough monsters of all levels, the only first-level unit that it doesn't feel wasteful to use a turn on (and I mean the FIRST turn), in a way that prevents the opponent from using it, is still Imp/Familiar, in my opinion. So that there's at least a little mana left (which doesn't always happen because it has high initiative). I rarely consider other first-level monsters...