When Yellow Sett has a buff, gets -3 power from Watcher, then Call to Glory is played (spending the buff and giving +3), what is Sett's final power?

Ruling: Sett's final power is 5. Power modifications are straightforward arithmetic: start with buffed Sett at 7 power (5 base + 1 from buff + 1 from Sett's passive doubling the buff), apply Watcher's -3 to get 4, remove the buff (losing 2 power) to get 2, then add Call to Glory's +3 to reach 5.

Sequence:

• Sett with buff alone: 7 power (5 base + 1 buff + 1 from Sett's passive)
• Watcher applies -3: 4 power
• Buff removed (losing +2 total): 2 power
• Call to Glory adds +3: 5 power final

Nuances:

• Sett's passive doubles buff effects on him (counts himself as a friendly unit)
• There is no mechanic where negative power "eats up" or cancels out positive modifiers from removed buffs - all modifications are simple addition and subtraction