Black to Play

The game has reached this extraordinary position, as if the game were played by Tal and Kasparov. Black has a significant advantage in the king's side, while white has a dominant position in center and in the queen's side. Both white's and black's kings are in desperate situations.

On our final analysis, the outrageous battle is concluded by a slight tempo advantage.

Trying a sharp counter attack, white makes a very threatening move, i.e. d5xe6.

What is the best move for black to conclude the game?