Discordant Abomination

Mutate (At the beginning of your upkeep, put a Mutation Counter on this creature. As long as this creature has an even number of Mutation Counters on it, it gets +1/+1. As long as this creature has an odd number of Mutation Counters on it, it gets -1/-1.)
As long as Discordant Abomination has an even number of Mutation Counters on it, it gains Shroud. As long as Discordant Abomination has an odd number of Mutation Counters on it, it gains Shadow.