Medusa, Rider of the 5th War

Deathtouch

Whenever Medusa attacks, you may pay {1}{b/g}.
If you do, create a 1/1 black Snake creature token with deathtouch.

{4}{b}: Until end of turn, whenever one or more Gorgons and/or Snakes you control deal combat damage to a player, that player loses half their life, rounded up.