Chaos Moon

{3}{R}

Enchantment

At the beginning of each player's upkeep, count the number of permanents. If the number is odd, until end of turn, red creatures get +1/+1 and whenever a player taps a Mountain for mana, its controller adds {R} to his or her mana pool. If the number is even, until end of turn, red creatures get -1/-1 and if a player taps a Mountain for mana, it produces colorless mana instead of its normal type.