Can Sett use his buff to draw a card from Monastery of Hirana's ability when capturing it, then regain the buff with his 'when I capture' ability?

Ruling: Yes, you can use Sett to capture Monastery of Hirana, stack the triggers to spend a buff to draw a card, and then regain the buff with his "when I capture" ability.

Sequence:

• Capture Monastery of Hirana with Sett
• Stack the triggers
• Spend a buff to draw a card (Monastery trigger)
• Regain the buff (Sett's "when I capture" trigger)

Nuances:

• If Sett has damage marked on him equal to his toughness (e.g., 4 damage on a 4 toughness unit), he will die from spending that buff under the new Comprehensive Rules.