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In a decisive 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 even the FIRST turn), so that the opponent can't benefit from it, is, in my opinion, Imp/Familiar. This way, you can have at least a little mana left (which doesn't always work out because it has high initiative). I rarely consider other first-level monsters...
