While this card is in face-up Attack Position on the field, this card is not destroyed as a result of battle. (Damage calculation is applied normally.) A monster that battled with this card cannot change its battle position, except with a card effect, or attack while this card is in face-up Attack Position on the field.
Cannot be destroyed if it's in face-up attack position.
Very low stats.
Effect is only active after it attacks or attacked.
Effect is only active when this card is present on the field.
Must always be in ATK position to prevent them being able to attack or to not be destroyable from battle.
Unhappy Girl for farming LDs
Why don't they attack?
The AI does not attack the unhappy girl to avoid getting their monsters locked. Because of the unhappy girl's effect, monsters that battle with the unhappy girl can't change their battle position or attack, and she can't be destroyed by battle, which is why the AI chooses to wait until they have enough monsters to win the duel.
The AI will not use their monsters to attack if the damage dealt is not higher than your LP.
If the AI has multiple monsters that can attack, and the total damage dealt is over your LP, then they will attack.
Unhappy Girl needs to be in attack position.
Since the unhappy girl's attack is 400, it reduces incoming damage by 400 per attack. You can calculate that if the AI has 3 monsters, they need a total of 5200 attack in order to deal 4,000 damage.
You can either increase your LP, or increase unhappy girl's attack to reduce incoming damage by using any attack increasing spell/trap cards.
An alternative to Holy Guard skill that's still effective if your opponent has no tribute monster. Once you manage to lock 3 of their monsters on the board, simply pass the turns instead of destroying them.