You can also use the effect of "Mind Master" to special summon a second and third "Psi-Blocker" and use its effect to stop your opponent from using several cards during their next turn.
This card has a crucial part in the "Mind Master" OTK. After the field has been flooded with several powerful Synchro Monsters or beat sticks, you can tribute the last low-level Psychic in order to summon this card. Since "Brain Research Lab's" destruction would clearly cause a game loss due to the counters, you can simply name it with this card's effect. Doing so will cause it to lose the ability to hold counters, nullifying the massive risk of a next-turn "Mystical Space Typhoon", "Giant Trunade" or even an activated "Necrovalley".