Infectious Vipers

Genome (When this creature enters the battlefield, put a +1/+1 counter on each other creature that share a type with it.)
Whenever Infectious Vipers deals combat
damage to a player, put a 3/3 Green and Blue Salamander creature token onto the battlefield under your control.
{g}{u} : Snakes you control becomes Salamanders in addition to their other
types until end of turn.