Can you spend multiple buffs on Monastery of Hirana when you conquer to draw multiple cards?

Ruling: No, you can only spend one buff to draw one card when you conquer with Monastery of Hirana.

Sequence:

• The triggered ability triggers once when you conquer
• You may spend a single buff as part of that one trigger
• You draw one card

Nuances:

• Even if you have multiple units with buffs, the ability only triggers once per conquer and allows spending only one buff ("a buff", not "buffs")