Keep the buff that makes the whole calculation work
Lee Sin, Centered · Monastery of Hirana
At Centered's battlefield, a buff supplies its own +1 Might and qualifies another unit for +2 more. Spending it can therefore remove three Might immediately. Effects that spend a buff, such as Monastery of Hirana's conquest draw, are only worth it when the unit losing that buff doesn't need those three Might for the next fight. If another unit you control has a buff it can spare, spend that one instead.
