Harfentyr, Billet of the Sands

Spend only mana produced by deserts to pay for Harfentyr, Billet of the Sands's activated abilities
that aren't mana abilities.
{2}, {t}, Pay 3 life: Add {w}{b}{g} to your mana pool.
{2}{w}, {t}: Remove target creature you control
from combat.
{2}{b}, {t}: Look at target player's hand.
{2}{g}, {t}: You gain 2 life.