When Convergent Mutation targets a unit to match Dr. Mundo's Might (which is 18 with 12 cards in discard), does the unit become 18 Might total, or does it gain +18 Might, and does it continue to track Mundo's Might if it changes later?

Ruling: The targeted unit's Might is increased to match Dr. Mundo's current Might at the time Convergent Mutation resolves. This is a one-time snapshot that does not continue to track Mundo's Might if it changes later.

Sequence:

• Check Dr. Mundo's current Might when Convergent Mutation resolves
• Increase the target unit's Might by the difference needed to reach that value
• The buff is static for the rest of the turn and does not update if Mundo's Might changes

Nuances:

• If the target unit already has Might, the increase is reduced by that amount so the unit ends up at the same total as Mundo (e.g., a 1 Might unit becomes 18 Might, gaining +17)
• If you play additional cards to discard after Mutation resolves, Mundo's Might increases but the mutated unit's Might does not