Gecko Moriah

Whenever a creature an opponent controls dies put a +1/+1 counter on Gecko Moria.
During your upkeep, you may move any number of +1/+1 counters from Gecko Moria to any number of zombies you control.
Whenever a zombie you control with a +1/+1 counter dies, you may move any +1/+1 counters from that zombie to Gecko Moria.