Enchantment, 2G (3)
Uncommon
Whenever a creature with power 5 or greater enters the battlefield under your control, you may put two +1/+1 counters on it.
Why settle for mere enormity?
Illus. Steve Prescott

10/1/2008: The ability checks that creature's power only once: when that creature enters the battlefield. The trigger checks a creature's initial power upon being put on the battlefield, so it will take into account counters that it enters the battlefield with and static abilities that may give it a continuous power boost once it's on the battlefield (such as the one on Glorious Anthem). After the creature is already on the battlefield, boosting its power with a spell (such as Giant Growth), activated ability, or triggered ability won't allow this ability to trigger; it's too late by then. Once the ability triggers, it will resolve no matter what the creature's power may become while the ability is on the stack.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern