Name: Unstable Mutation
Type: Enchantment — Aura
Rules Text: Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.
Set/Rarity: Time Spiral "Timeshifted" Special, Fifth Edition Common, Fourth Edition Common, Revised Edition Common, Arabian Nights Common