If Mundo is at 12 power on a battlefield and Unchecked Power deals 12 damage to all units at that battlefield, does Mundo survive due to gaining +1 power when Unchecked Power goes to the graveyard?

Question

Accepted Answer

Most likely no. Mundo will not get the +1 before the 12 damage is dealt, so he dies if the 12 damage is lethal to his current Might at that moment [710].

When Unchecked Power resolves it exhausts friendly units, then deals 12 to all units as part of that resolution. Damage is evaluated against each unit’s current Might as that damage is dealt, so any +1 Mundo would gain from Unchecked Power being in the graveyard would occur after the spell has finished resolving and moved to the graveyard — too late to affect that damage. Therefore Mundo does not survive due to that delayed +1 in the most defensible reading [710].

Unchecked Power begins resolving. Unchecked Power exhausts all friendly units as its first effect. Unchecked Power then deals 12 damage to all units as the next effect while the spell is still resolving. Damage is applied using each unit's current Might at that moment [710]. After the spell finishes resolving it would be moved to the graveyard, at which point any triggered effects tied to it entering the graveyard would go on the chain (too late to affect the already-resolved damage).

If Mundo's text instead triggers "when a spell is played" or is a replacement/static effect that raises his Might while Unchecked Power is resolving (rather than waiting until Unchecked Power is in the graveyard), then the +1 could be present for the damage and might change the outcome. Also, if Mundo's ability is worded as a continuous/replace effect that watches the spell move differently than assumed here, timing could differ. Because Mundo's exact text is not provided, these are possible alternate outcomes.

The key principle is that units are evaluated by their current Might at the time damage is dealt [710]. Unchecked Power explicitly resolves by first exhausting friendly units, then dealing 12 to all units. The 12 damage is part of the spell’s resolution — it is dealt while the spell is resolving, before the spell is finished and (under the usual timing assumptions) moved to the graveyard. Any effect that triggers "when Unchecked Power is put into the graveyard" would therefore occur after the spell has fully resolved and after the damage has already been dealt, so that triggered +1 would not be present to alter the Might used for that damage. Therefore, in the most defensible interpretation given the provided rules and card text, Mundo does not survive because he does not gain the +1 in time to affect the damage calculation [710]. Note: Because the provided Core Rules excerpt does not explicitly state the timing of moving a resolving spell to the graveyard, I assumed the common timing that the spell finishes resolving before it is moved to the graveyard; if Mundo instead triggers on "spell played" or has a continuous effect that applies earlier, the result could differ [357].