Serpentform Seducer

When this enters the battle field put a dominate counter on target creature.
You control all creatures with a dominate counter on them they gain +2/+2 and deathtouch.
{1}{b}{t}, Sacrifice target creature with a dominate counter on it. You gain 3 life. Put 2 +1/+1 counters on Serpentform Seducer.
{4}{b}{b}, Put a dominate counter on target creature. If you control at least 3 creatures with dominate counters on them this becomes a 10/10 black Titanic snake until the end of turn.