Used against a speed deck this card would truly be devastating. Especially the upgraded one.
How about giving it a Nerf likt this:
NAME: | Forget
| ELEMENT: | Darkness
| COST: | 3
| TYPE: | Spell
| ABILITY: | Opponent draws 2 Cards and discards 1 Cards at random.
|
| NAME: | Brainwash
| ELEMENT: | Darkness
| COST: | 3
| TYPE: | Spell
| ABILITY: | Opponent draws 3 Cards and discards 2 Cards at random.
|
|
6x the upgraded card would destroy 12 Cards and let the opponent draw 18 cards. With a perfect starting hand, the game would be over in 5 turns, for a 30 Cards Deck Opponend. Though that won't happen even once in 100 games. Usually one would win after 11 turns (chance about 52%, considered only brainwash). If a rush deck let you survive this long, it deserves to lose
Each time played it also gives one cardadvantage to the opponent. So all in all the opponent would have an advantage out of this card.
Still... I'd defenitly put that card in my deck.