Zaarhua, the Last Paradise

Zaarhua, the Last Paradise enter in the battelfield tapped.
{t}: Add {g}{g}, {g/u} or {u}{u}.
{g/u}{g/u}{g/u}, Pay 5 life: You gain 10 life.
{t}{x}{g/u}{u}{g}: Eeach opponent gains {x} life. For each life gained in this way, you create a 3/3 Green and Blue Dinosaur
Turtle Beast with Trample.