Jurassic Gorge

As Jurassic Gorge enters the battlefield, you may reveal a dinosaur creature card from your hand.
If you don't, Jurassic Gorge enters the battlefield tapped.
{t} Add {r} or {g}
{2}{r}{g}: Jurassic Gorge becomes a 3/3 dinosaur
with trample until end of turn. It's still a land.