You control up to seven lands that can tap to produce at least ({5} magic symbol) ({W} magic symbol) ({W} magic symbol) ({W} magic symbol) .
Steps
Activate up to seven mana-producing lands by tapping them, adding at least ({5} magic symbol) ({W} magic symbol) ({W} magic symbol) ({W} magic symbol) .
Activate Livio's first ability twice by paying ({2} magic symbol) ({W} magic symbol) ({W} magic symbol) , exiling Palinchron and Great Oak Guardian with aegis counters on them.
Activate Livio's second ability by paying ({2} magic symbol) ({W} magic symbol) and tapping it, returning Palinchron and Great Oak Guardian from exile to the battlefield.
Great Oak Guardian and Palinchron enter the battlefield, triggering their abilities.
Resolve the Palinchron trigger, untapping up to seven lands you control.
Resolve the Great Oak Guardian trigger, untapping each creature you control and giving them +2/+2 until end of turn.