Kei Takahashi, the Afflicted

Riot
{2}{b/r}{w}: Prevent the next 3 damage that would
be dealt to target creature this turn. For each 1
damage prevented this way, put a -1/-1 counter
on the source of the damage if it's a creature.
"Xira's spawn has greatly aroused Kei's aggression.
Where there was once a gifted mender, he now heals
with one hand even as he harms with the other."
—Ayesha Tanaka, journal