Aethertide Whale and allowing you to cast it from exile this turn.
Resolve
Petals of Insight, putting the top three cards of your library on the bottom of your library, and returning
Petals of Insight to your hand.
Cast
Aethertide Whale from exile by discarding
Petals of Insight.
Conspiracy Theorist triggers, exiling
Petals of Insight and allowing you to cast it from exile this turn.
Aethertide Whale enters the battlefield, causing you to get six ({E} magic symbol) .
Activate
Aethertide Whale by paying ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) , returning it to your hand from the battlefield.