Dr. Altu, Corpse Salvager

When Dr. Altu, Constructor enters the battlefield
or during your upkeep, you may create Herb, a legendary 6/6 artifact zombie creature token.
{1}{b}{w}: Place a vigilance, reach, or +1/+1 counter
on target zombie or artifact creature you control.
{t}{u/b}{u/b}: Regenerate target zombie or artifact
creature you control.