Meiar, Bathed in Color

Landfall - Whenever a land enters the battlefield under your control, untap Meiar, Bathed in Color.
{x}, {t}: Reveal the top X cards of your library.
Add mana in any combination of colors to your mana pool equal to the number of different colors among cards revealed this way plus 1.
Then shuffle your library.
Awake to vibrancy.