Aetherflux Hideaway

Hideaway (This land enters the battlefield tapped. When it does, look at the top four cards of your library, exile one face down, then put the rest on the bottom of your library.)
{t}: Add one mana of any color
{2} {t}: You may play the exiled card without paying its mana cost or any additional costs if you pay 10 life.
"What? You thought I wouldn't put one in?"