Nexxa, Simic Evolutionary

Evolve, Undying
Graft 1 (This creature enters the battlefield with a +1/+1 counter on it. Whenever another creature enters the battlefield, if this creature has a +1/+1 counter on it, you may move a +1/+1 counter from this creature onto that creature.)
"Progress is neither automatic nor inevitable. We have sacrificed much for Project Nexxa's evolutionary perfection." --Momir Vig, Simic Visionary