A creature you control has at least one +1/+1 counter on it.
({1} magic symbol) available.
Steps
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from any creature you control, creating a 1/1 Saproling creature token.
Activate Phyrexian Altar by sacrificing the Saproling, adding ({1} magic symbol) .
The Saproling dies, triggering Vogar's first ability, putting a +1/+1 counter on Vogar.