Srylli, Grand Illusionist

Whenever Srylli, Grand Illusionist enters the
battlefield, create X 1/1 blue Snake Illusion
creature tokens with deathtouch.
{u}{u}, {t}, Sacrifice a Snake Illusion:
Put two +1/+1 counters on Srylli, Grand Illusionist.
Whenever Srylli, Grand Illusionist dies,
sacrifice all Snake Illusions you control.