This is very useful on a monster with high ATK like Glyde or Asriel Dreemurr. Use Poison on either of them, followed by Brain Shift to deal 10 damage to the enemy. This can work with both your own and the enemy's monsters, so watch out if you face a Perseverance player, as it only costs 7G for the Poison + Brain Shift combo.
This works well against Kindess Madjick decks. Just swap the high-health monster's stats before they can and use this card on it to give them a taste of their own medicine.
When it came out, it was a bit bugged as it wouldn't show the damage it did despite it actually damaging the enemy.
The image shown on the card is used for the background during the fight against Asriel Dreemurr.