When Swap is cast on Dr. Mundo and another unit, does it create temporary power modifiers that persist for the turn, or does it only look at base might? Specifically, if Mundo has 16 power from his passive and swaps with a 2 power unit, does he stay at 2 power for the turn or immediately return to 16?

Ruling: Swap creates +/- power modifiers in the arithmetic layer that persist for the turn. When Mundo swaps power with a weaker unit, he receives a negative modifier that lasts the entire turn, preventing his passive from immediately restoring his previous power level.

Sequence:

• Mundo at 16 power (10 cards in grave) and Purple Poro at 2 power
• Swap is cast
• Swap applies -14 power to Mundo and +14 power to Poro
• These modifiers persist for the turn
• Mundo's passive continues to add power as more cards enter the grave during the turn

Nuances:

• Mundo's passive ability still functions and will continue to increase his power as additional cards are added to the grave during the turn, building on top of the negative modifier from Swap
• The "base might" interpretation was discussed before Swap was officially defined but is not correct