The monster which was summoned by "Give and Take" can be used for "Fortune Lady Dark's" effect.
If your opponent controls at least 1 monster, you can use "Give and Take" to Special Summon a monster with a high level and a high ATK and to increase the level of "Fortune Lady Dark". Then, with the high ATK of "Fortune Lady Dark", you can easily destroy a monster that was not Special Summoned with "Give and Take", and inflict damage if that monster was in Attack Position. Then, Special Summon a "Fortune Lady Fire" with "Fortune Lady Dark's" effect and destroy the monster which was Special Summoned with "Give and Take" with "Fortune Lady Fire's" to inflict damage to your opponent.
With "King Tiger Wanghu" on the field with this card and a "Fortune Lady Light" in the Graveyard, you can create a massive field advantage whenever "Fortune Lady Dark" destroys a monster by battle.
Tribute "Fortune Lady Dark" for another "Fortune Lady Dark" so that when you destroy an opponent's Monster by battle, you will be able to Special Summon the first and continue the swarming process if there is another Monster on your opponent's side of the field.
Alternately tribute "Fortune Lady Water" or "Fortune Lady Fire" to summon this card and when opponent monster is destroyed by her attack. You can draw 2 card or destroy another monster and inflict damage to opponent.