Guardian of the Herd

Defender
{1}{w}{t}: Create a 1/1 white centaur token.
{6}: Guardian of the Herd gains Lifetouch until end of turn. Any player may activate this ability.(This creature heals for its power during the damage step rather than dealing damage.)
Whenever another centaur dies, Guardian of the Herd loses Defender and gains Double Strike and Trample until end of turn.