Restless Vinestalk

Restless Vinestalk enters the battlefield tapped.
{t}: Add {u} or {g}
{3}{u}{g}: Until end of turn, Restless Vinestalk becomes a 5/5 blue and green Plant creature with Trample. It's still a land.
Whenever Restless Vinestalk attacks, up to one target creature has base power and toughness equal to 3/3 until end of turn.