If Sett Brawler spends his buff (decreasing his Might from 5 to 4) to increase his Might to 8, does this trigger Fiora's Legend ability which triggers when a unit becomes Mighty?

Question

Accepted Answer

Yes — under normal assumptions, Sett - Brawler will trigger a “when a unit becomes Mighty” legend (like Fiora) when you spend his buff and then give him +4 this turn. Paying the cost (spending the buff) drops him from 5 to 4, and when the +4 resolves it raises him from 4 to 8, which is a change from <5 to ≥5 and therefore “becomes Mighty.”

Yes. Because costs are paid before an ability resolves [357], spending the buff reduces Sett’s Might from 5 to 4 (buffs give +1 each [703]). When the ability’s effect then gives +4 this turn, his Might changes from 4 to 8 and he “becomes Mighty” at that moment per [709], triggering any abilities that watch for a unit becoming Mighty.

Start: Sett - Brawler is at Might 5 (including its buff(s)). Player activates Sett’s "Spend my buff: Give me +4 :rb_might: this turn" ability and pays its cost. Paying that cost includes spending/removing one buff, which reduces his Might by 1 (each buff = +1 [M]) per [703] and costs are paid before resolution per [357]. Sett’s Might becomes 4. The ability resolves and grants Sett +4 :rb_might: this turn, changing his Might from 4 to 8. When his Might changes from less than 5 to 5 or greater (4 → 8), he "becomes Mighty" at that moment [709], so any triggered ability that watches for a unit becoming Mighty (e.g., Fiora’s legend trigger as described) will trigger.

If "spend my buff" does not actually remove a buff (for example, if the text instead means "spend the +4 buff effect" rather than remove a +1 buff token), then the intermediate drop to 4 might not occur and the outcome could differ. If a replacement effect or continuous effect modifies or prevents the Might change when the cost is paid (or when the +4 is applied), that could prevent the unit from ever being <5 before the +4 applies, and thus it would not "become Mighty" in that sequence. If the legend’s trigger specifically watches only your units or only other units, or has additional conditions not stated, that could change whether it triggers. If the spend+gain are part of a single effect that the game rules treat as atomic with no intermediate state (contradicted by [357], but relevant if a card’s templating creates a single inseparable instruction), the precise timing could be disputed; however, under the normal rules for costs and resolution, the intermediate 5→4 state exists.

Key rules: each Buff gives +1 Might [703]; costs are paid before an ability resolves [357]; a Unit "becomes Mighty" when its Might changes from <5 to ≥5 [709]; units are evaluated at their current Might as effects resolve [710]. Sett’s activated ability is formatted as a paid cost next to an effect ("Spend my buff: Give me +4 this turn"). When you activate that ability you pay the cost first — spending/removing one buff — which reduces Sett’s Might by 1 (because each buff contributes +1 [703]). That brings him from 5 to 4. Then the ability resolves and grants +4 this turn, taking him from 4 to 8. The change from less than 5 to 5 or greater (4 → 8) is precisely when a unit "becomes Mighty" per [709]. Therefore any triggered ability that listens for a unit becoming Mighty (such as the Fiora legend text as described) will trigger at the moment the +4 resolves and raises Sett to 8, assuming no other replacement or continuous effects interfere and that the trigger’s scope/conditions are met.