In a Munchkin game yesterday, a level 8 player (let's call her "Jennifer") was fighting a Hippogriff. After counting gear bonuses, Jennifer's combat strength was 15 and the Hippogriff's was 16.
If Jennifer won the combat, she would have won the game, so people started unloading cards that affect combat. The following cards were played:
- Jennifer used a "+3 to either side, usable once only" (+3 UOO) card to help herself, making the fight 18/16 in her favor
- Another player used a +3 UOO card to help the Hippogriff, making the fight 18/19.
- Jennifer used a +2 UOO card on herself, and another player used a +2 UOO card for the Hippogriff (20/21)
- Jennifer used a +5 UOO card on herself, and another player used a +5 UOO card for the Hippogriff (25/26)
- Jennifer used a "-5 to monster" card on the Hippogriff, and another player used a +5 UOO card for the Hippogriff (25/26)
- Jennifer used a +2 UOO card on herself, making the combat 27/26 in her favor
At this point, another player threw down Illusion and Plutonium Dragon to replace the Hippogriff. The relevant part of Illusion is
Discard any one monster in this combat, along with any cards that have been played to modify it, and replace with a monster card from your hand.
We then had a long argument about which cards remained in play.
All of us immediately agreed that the "-5 to monster" card was a modifier for the Hippogriff, and disappeared with the Hippogriff.
For UOO cards played to help Jennifer, half of us thought that they were gone, because they had already been "thrown," "fired," "drunk" or otherwise used up. The other half thought that the cards remained in play, because it was still the same combat and Illusion didn't explicitly say that anything should be done about cards played to help the munchkins' side.
Most of us argued that the UOO cards played to help the Hippogriff's side of the combat also went away. Some of us cited the wording of Illusion; others thought they too were used up. A few of us maintained that UOO cards are not technically "modifiers," and therefore should have remained in play.
What should have happened in this combat (assuming no further cards were played)?