This is a revised version of Spoils of War. There are some subtle differences especially in regards to the extra mana cost specified in the original. Add a Location named Battlefield, and give it 50 Corpses. The text of the location’s effect contains three dates: X, Y, and Z. X is the day this proposal is enacted, Y is three days after X, and Z is six days after X. The effect text is as follows:

After X and before Y, after performing the Reanimate Corpses action, the risen Shambler becomes a Ghoul if the Necromancer spends an additional 2 mana. If the Necromancer cannot or does spend the additional cost, then the Shambler remains whatever it originally was. After Y and before Z, after performing the Reanimate Corpses action, the risen Shambler becomes a Skeleton; the mana cost is not modified. The number of Corpses at this Location cannot be increased. After Z the battle has returned to this field, any Necromancer still at this location has their location set automatically to Tower, and no Necromancer may set their location to the Battlefield.