Elvish Archdruid does not have summoning sickness.
You control at least five additional Elves.
Steps
Activate Elvish Archdruid by tapping it, adding at least six ({G} magic symbol) .
Activate Kogla by paying ({1} magic symbol) ({G} magic symbol) and returning Hyrax Tower Scout from the battlefield to your hand, giving Kogla indestructible until end of turn.