Jegantha and Go-Shintai do not have summoning sickness.
You control another nontoken Shrine.
Steps
Activate Phantatog's first ability by sacrificing another nontoken Shrine, causing Phantatog to get +1/+1 until end of turn.
Activate Jegantha by tapping it, adding ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) that cannot be spent to pay generic mana costs.
Activate Go-Shintai by paying ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) and tapping it, returning any Shrine from your graveyard to the battlefield.
When the Shrine enters the battlefield, Go-Shintai triggers, creating a 1/1 Shrine enchantment creature token.
When the Shrine token enters the battlefield, Intruder Alarm triggers, untapping all creatures.