When playing Stormbringer after Darius, does Stormbringer use Darius's base Might of 5 or his resolved Might of 7?

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When you resolve Stormbringer, it uses the unit's current/resolved Might on the board at the time the damage is dealt. So if Darius currently has 7 Might on the board when Stormbringer deals damage, it deals 7 damage (not his 5 base).

Use the unit's current (resolved) Might when Stormbringer deals damage. In this example, Darius's 7 Might is used. [710]

You play Stormbringer and choose a friendly unit in your base (e.g., Darius). That choice creates the spell's relationship to that game object as described by the targeting rules/FAQ. [FAQ:unleashed#22] When Stormbringer resolves and its instruction "Deal damage equal to its Might to all enemy units at a battlefield" is carried out, the game evaluates the chosen unit's Might at that moment — using its current/resolved Might on the board. [710] Therefore, the damage amount equals the unit's current Might (7 in your example), not the unit's printed/base Might (5). [710] [709] After dealing damage, Stormbringer then moves your unit to that battlefield as its text instructs.

If Darius's Might changes between when you choose him and when Stormbringer resolves, the damage uses whatever his Might is at the moment the damage is dealt (per [710]). If Darius is moved to a non-board zone (e.g., killed and sent to void or hand) before Stormbringer resolves, the targeting relationship is severed and the spell's behavior will be affected accordingly (the object is no longer the same game object). See [FAQ:unleashed#22]. If an effect replaces or redirects parts of Stormbringer's resolution (e.g., replacement effects that change how damage is dealt or how moves are performed), those replacement effects apply as usual and could change outcomes; the core principle that damage uses the current Might still applies when damage is actually dealt. [710]

Damage amounts are determined using a unit's current/resolved Might at the time the damage is dealt. The Core Rules state that "Units on the board are evaluated according to their current Might" [710]. So when Stormbringer resolves and performs "Deal damage equal to its Might...", you check the chosen unit's Might at that moment and use that number (7 in your example). The targeting/choice relationship created when you choose the unit is preserved as long as the unit remains on the board, per the official FAQ about targeting relationships [FAQ:unleashed#22]. If the chosen unit left the board (moved to a non-board zone) before resolution, the object relationship would be severed and the handling could differ; but assuming Darius is still a board object, the resolved Might (7) is used, not his printed/base Might (5). [710] [709] [FAQ:unleashed#22]