You control a creature with a +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 a creature you control, creating a 1/1 Saproling creature token.
The Saproling enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
Activate Phyrexian Altar by sacrificing the Saproling, adding ({1} magic symbol) .