Vizier of Remedies 

Creature — Human Cleric
If one or more -1/-1 counters would be put on a creature you control, that many -1/-1 counters minus one are put on it instead.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL