Slithar, Mother of Snakes

Deathtouch
When Slithar, Mother of Snakes enters the battlefield, create X 1/1 snake creature token with deathtouch, where X is the number of lands you control.
[landfall] Whenever a land enters the battlefield,
choose one:
-create a 1/1 snake creature token with
deathtouch.
-Put a +1/+1 counter on every snake creature
tokens you control.