If Sett - Brawler spends his buff to get +4M, does that trigger Fiora's leader ability?

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Accepted Answer

I don’t have the exact card texts for Sett - Brawler or Fiora here. With the typical templating used in Riftbound and the rules provided: if Sett - Brawler ends resolution with enough final Might to meet whatever “Mighty” threshold Fiora’s leader ability cares about, then that final change in Might is what matters and will be observed by Fiora. Key rules: each Buff is +1 Might [703], and layer re-evaluation handles removals and subsequent ability checks [471].

Assuming Fiora's leader ability triggers when a unit becomes (or is) Mighty, and assuming Sett - Brawler’s “spend a buff to get +4 Might” is an effect that resolves by removing the buff (if it is a cost) and then granting +4 Might, then yes — if after resolution Sett - Brawler’s final Might meets the Mighty threshold, Fiora will see that and her ability will function accordingly. This follows layer re-evaluation and the definition that each Buff is +1 Might [703] and removal/application are handled per layers [471].

Player activates Sett - Brawler’s effect and pays any costs. If paying the cost requires removing a Buff token, that removal happens as part of paying costs (finalization) and will no longer contribute +1 Might after removal [471.3] [703]. The effect that grants +4 Might (if that is what the ability does) then resolves and applies its Might change in the Arithmetic layer; after that layer resolves, the layers are re-checked per the layering rules so any ability-altering results that depend on Might can now apply [471.1] [471.2]. If Fiora’s leader ability triggers based on a unit becoming or being at/above the Mighty threshold, the game will observe Sett’s final Might after the above removals/applications, and treat that final value for whether Fiora’s condition is satisfied. Information that is referenced is checked on execution, so the final resolved Might is what gets used [359.3.f.2]. If Fiora’s effect is a continuous ‘While I’m Mighty…’ text, that is applied as an ability-altering effect during the relevant layer and will be present only while the final Might meets the condition; if it is a triggered ‘When a unit becomes Mighty…’ then the trigger timing depends on the exact templating and may put a triggered ability on the chain per the triggered-ability rules [FAQ:unleashed#1] [FAQ:unleashed#2].

If Sett - Brawler’s card text literally treats removing/spending a Buff as a one-to-one +1 Might transfer rather than removing then granting a separate +4, the math and outcome could differ; the exact printed templating matters (we don’t have the card text). If Fiora’s leader ability is worded as a continuous static ability (“While a unit is Mighty…”) instead of a trigger (“When a unit becomes Mighty…”), then it is not a trigger and won’t be placed on the chain — it simply is or isn’t active based on final values [471.3]. If the spending of a Buff is part of a triggered ability’s cost/instruction, the decision to place that ability on the chain and its finalization follow the triggered-ability split rules; costs within instructions are paid during finalization, so checks occur on resolution/finalization steps [FAQ:unleashed#1] [FAQ:unleashed#2]. If an effect replaces or prevents the Might change entirely (or if something causes no change in Might), then Fiora will not see a change that triggers anything — layer application and replacement effects can prevent triggers depending on timing [471.3].

Short answer: I don’t have the actual printed texts, but under the rules you provided the game looks at the final resolved Might after removals and applications. Each Buff is worth +1 Might [703]. Removal of an effect (like spending/removing a Buff as a cost) is handled separately from applying other effects, and the layers are re-evaluated until stable [471.3] [471.1] [471.2]. That means if Sett - Brawler spends/loses a Buff as part of paying a cost and then an effect grants him +4 Might on resolution, the net final Might after those steps is what the game uses to determine whether Fiora’s ability is active or whether a “becomes Mighty” trigger condition is satisfied (information is checked on execution/resolution) [359.3.f.2]. If Fiora’s leader ability is a triggered ability that requires a unit to become Mighty, use the triggered-ability templating rules to determine when and how the ability is placed on the chain and finalized [FAQ:unleashed#1] [FAQ:unleashed#2]. If you can paste the exact printed text of both Sett - Brawler and Fiora (leader text), I can give a precise, card-text-level ruling.