Vincent

Flash, Flying, Lifelink, Deathtouch
({p/b} can be paid with either {b} or 2 life.)
{p/b}: Swap Vincent's power and toughness
until end of turn.
{p/b}, {t}, discard 1 card: Target creature loses all
abilities and becomes a black Vampire creature
with base power and toughness 2/2.