Simic Biocollector

Graft 2 (This creature enters the battlefield with two +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)
As Simic Biocollector enters the battlefield, choose a creature type. Whenever you move a +1/+1 counter from this creature to a creature with the chosen type, gain control of that creature.