Serpentine of Si Sea

{u}Scry 1
{b}Give target creature -1/-1 until of turn
{u}{u}{b}{b}Give target creature a Poison Counter
{t}{u}{u}{u}{b}{b}{b}Give target player or Planeswalker three Poison Counters.
"All sailors know the scream, the spines, but no sailor knows entirely what its teeth look like, except for the dead ones."