Can a card with 'Spend my buff:' ability spend its own buff without other cards, and can it be used multiple times per turn?

Ruling: The card's ability itself spends the buff. The 'Spend my buff: effect' pattern is an activatable ability that can be activated as many times per turn as you can pay the cost.

Sequence:

• The ability follows the pattern 'cost: effect' where the cost is 'spend my buff'
• It can be activated multiple times as long as you can pay the cost each time

Nuances:

• Can only be activated during your turn outside of a showdown and chain
• Exception: If the effect has the 'action' or 'reaction' keyword, different timing rules apply