Enchantment — Aura, U (1)
Common
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.
Illus. Charles Gillespie

8/1/2005: The -1/-1 counters stay even if the Aura is removed, and the +3/+3 goes away when the Aura does.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern