Ghave has at least two +1/+1 counters on it, or there is a +1/+1 counter on another creature you control.
({2} 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 two 1/1 Saproling creature tokens.
Activate Ghave's second ability by paying ({1} magic symbol) and sacrificing a Saproling.
When the Saproling dies, Pitiless Plunderer triggers, creating two Treasure tokens.
Resolve the Ghave ability, putting a +1/+1 counter on it.
Activate both Treasures by tapping and sacrificing them, adding ({2} magic symbol) .