Alaundo the Seer does not have summoning sickness.
Steps
Activate Alaundo the Seer by tapping it, causing you to draw a card and exile a card from your hand with time counters on it equal to its mana value, then removing a time counter from each other card you own in exile.
The Locust God triggers, creating a 1/1 Insect creature token with flying and haste.
When the Insect enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.
Results
Cast a portion of the cards in your library and hand without paying their mana costs.