Tamor, Gloomglade Summoner

Whenever you activate one of Tamor's abilities, put a -1/-1 counter on Tamor.
{b}: Create a 1/1 black Bird creature token
with flying.
{1}{b}{g}: Create a 3/3 black and green Cat creature token with deathtouch.
{2}{g}{g}{g}: Create a 5/5 green Treefolk creature token with trample.