Pointed Discussion

my power is gone

That's a nice green ramp deck you have there...

This card is a pretty good example of why the mana burn rule existed. Tapping all your opponent's mana is one thing, but taking damage for all of it is another.

That said, imagine this thing at instant speed.

Late game, Drain Power the opponent and combine with your mana to Braingeyser their library to 0.