Salazah, Mother of Scales

Deathtouch, Lifelink
When Salazah, Mother of Scales enters the
battlefield,if you control a Gorgon,
Naga, and Snake creature, draw 4 cards.
Whenever you cast a Gorgon, Naga,
or Snake creature, you may draw a card.
Salazah, Mother of Scales has hexproof if you
control 4 or more creatures.