Paying {4}{U}{U} and transforming Jacob Hauken, Inspector is part of the resolution of the activated ability. You draw a card and exile a card before choosing whether to pay.
Jacob Hauken, Inspector // Hauken's Insight
You may play cards this way that were exiled with Jacob Hauken, Inspector before it transformed into Hauken's Insight.
Once Hauken's Insight leaves the battlefield, the player that controlled it may no longer play the exiled cards. If it's destroyed and somehow returns to the battlefield, it's a new object with no memory of the previously exiled cards.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Slawomir Maniak
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
