Brain Shift is Perseverance's 2nd Epic Effect card added in Beta 11.0 during the Undercards 1 year Anniversary. Previous Versions can be found here. When used on a monster with KR, including one of your own, it will deal its ATK as damage to the enemy and remove its KR.
PC Computer - Undertale - Asriel Dreemurr Battle Background

Azzy D.'s background.


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 6G 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.

Receptionist 3 can also be able to aid, being a low cost monster that will likely summon a high ATK monster for the enemy, so you can PoisonShift it and deal a lot of damage to the enemy.

Note that this card will only do a max of 10 damage, so without including ATK buffs, the monsters that will deal less damage than their ATK is are Omega Flowey (who has 11 ATK) and Chara (who has 99 ATK).


  • 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.