Rokrol, dwindling doom

when Rokrol, dwindling doom enters the battlefield with X +1/+1 counters on it. Whenever a creature either than Rokrol, dwindling doom gains a +1/+1 counter, put double that many on Rokrol, goliath hydra. at the beginning of your end step, remove a
+1/+1 counter from this creature and put one on another target creature. this does not trigger
its ability.