Sheldon J. Plankton

If Plankton is your commander as the game begins, an opponent of your choice gets an emblem named Krabby Patty Secret Formula.

Whenever a creature you control deals combat damage to the Krabby Patty Secret Formula's controller, you draw two cards and lose 2 life.

At the beginning of your end step, you lose X life, where X is the number of cards in your hand
minus 4.