Ljósálfar

When Ljosalfar enters the battlefield give target creature either a +1/+1 counter or -1/-1 counter
{t}: {g} give target player either 3 life or 3 poison counters
{g}: give target creature -3/-3 until end of turn
one +1/+1 counter
The elves are unpredictable, sometime they give cure
to disease, other times they bring the disease