When Ojer Kaslem dies, it triggers, returning itself from your graveyard to the battlefield as Temple of Cultivation and untapped due to Spelunking.
When Temple of Cultivation enters the battlefield, Nissa triggers, adding ({G} magic symbol) .
Activate Temple of Cultivation's second ability by paying ({2} magic symbol) ({G} magic symbol) and tapping it, transforming Temple of Cultivation into Ojer Kaslem.