Talrani, the One Who Knows

When Talrani, the One Who Knows enters the battlefield, draw X cards or add an amount of {g} equal to X, where X is the number of Elf creatures you control.
{x}{u}{g}{g}, {t}: Create X tapped green 1/1 Elf Warrior tokens, then you may return target creature to its owner's hand. Activate this ability only once each turn.