Skarlet, Mistress of Blood

Pay {3}, deal 2 damage to target creature an opponent controls and gain a blood charge.
Once you have 3 or more blood charges you gain +1/1 instantly and whenever you gain another.
Sacrifice 1 blood charge, Skarlet becomes unblockable until end of turn.
"You Osh-Tekk may practice blood magic, Kotal, but I am the master" -Skarlet