Sangrogoyf

Sangrogoyf gets +0/+1 for each 1 life gained by a player this turn.
Sangrogoyf gets +1/+0 for each 1 life lost by a player this turn.
As long as Sangrogoyf's power or toughness is 15 or greater, it cannot be blocked except by Lhurgoyfs, Vampires, and Eldrazi.