Does Sett need a different card to use his buff, or can he remove his own buff to get +4 Might?

Ruling: Sett has an activated ability that costs spending the buff that is on him to give him +4 Might. You can only activate the ability on your turn outside of showdown.

Sequence:

• Sett must have a buff on him
• On your turn outside of showdown, you can activate his ability
• Pay the cost by spending the buff on him
• He gets +4 Might