Activate a basic land, adding ({1} magic symbol) .
Activate Ghave's second ability by paying ({1} magic symbol) and sacrificing Strangleroot Geist.
Strangleroot Geist's undying ability triggers, returning it to the battlefield with a +1/+1 counter on it.
Resolve Ghave's ability, putting a +1/+1 counter on any creature you control besides Strangleroot Geist.
Activate Earthcraft by tapping Strangleroot Geist, untapping a basic land.
Activate a basic land, adding ({1} magic symbol) .
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from Strangleroot Geist, creating a 1/1 Saproling creature token.
Activate Earthcraft by tapping a Saproling creature token, untapping a basic land.
Repeat.
Results
Infinite +1/+1 counters on all creatures you control besides Strangleroot Geist.