Instant, 2G (3)
Common
Untap target creature. It gets +2/+4 and gains reach until end of turn. (It can block creatures with flying.)
"Nobody's seen the Lady of Videns for years. Poor dear, no companions at all in that old castle."
—Yonda of Gavony
Illus. James Ryman

9/22/2011: Spidery Grasp can target a creature that's already untapped. It will still get +2/+4 and gain reach.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern