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
Great Whale and
Corridor Monitor with aegis counters on them.
Activate
Livio's second ability by paying ({2} magic symbol) ({W} magic symbol) and tapping it, returning
Great Whale and
Corridor Monitor from exile to the battlefield.
Corridor Monitor and
Great Whale enter the battlefield, triggering their abilities.
Resolve the
Great Whale trigger, untapping up to seven lands you control.