If I attack with a 1 might unit that has a buff on it against Ahri Legend's battlefield, then spend the buff using Call to Glory, what will my unit's final might be?

Ruling: The unit will end up at 3 might.

Sequence:

• The unit enters combat at 2 might (1 base + 1 buff)
• Ahri Legend's ability triggers and resolves, reducing might by 1 (now at 1 might, with the -1 reduction "snapshotted")
• Call to Glory is used, removing the buff (-1) and adding +3
• The unit goes to 0 might from losing the buff, then gains +3 from Call to Glory
• Final might is 3

Nuances:

• Units can have negative might or go below 1 might, but this won't kill them unless they receive damage
• Might below 1 is treated as zero for combat purposes
• Ahri Legend's ability is "snapshotted" when it resolves, meaning the reduction amount is locked in based on the unit's might at that moment