Enchantment, 1W (2)
Uncommon
{1}{W}: Target nonattacking, nonblocking creature gets +0/+2 until end of turn.
"Strange alliances are alliances still, and provide the same protection."
—King Darien of Kjeldor
Illus. Phil Foglio

10/4/2004: The bonus is not lost if the creature later becomes an attacker or blocker. The limitation is just there to prevent the effect from being used late in an attack.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Commander