Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from a creature you control, creating a 1/1 Saproling creature token.
The Saproling enters the battlefield, triggering Ivy Lane Denizen, putting a +1/+1 counter on the Saproling.
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from the Saproling.
Holding priority, activate Phyrexian Altar by sacrificing the Saproling, adding ({1} magic symbol) .
Resolve the Ghave ability, creating a 1/1 Saproling creature token.