Dr. Punto, the Plaguebearer

This card can only be your commander.
Lifelink. Once per turn you may activate one of these abilities at sorcery speed:
Spend {x}{x}{b}, Other creatures get -{x}/-{x}
until end of turn.
Spend {x}{x}{w}, {x} creatures gain lifelink.

To some he is a savior, for others their doom.