Bloodletting

Indestructible, if you control human.
Bloodletting cannot target any artifact
creature &/or vehicle. Bloodletting
cannot target the same creature more
than once per turn.
{2}: Tap 1 creature you control, untap
up to 2 black creatures &/or vampires
you control.
"A bizarre superstition. One wonders who
is really behind this 'medical' practice."