Sierra Farmer

{x}{w}, {t}: You gain X life. Activate this ability
only if you control a Mountain.
{x}{w}{w}, {t}: Put X +1/+1 counters on target
creature. Activate this ability only if you control
three or more Mountains.
{x}{w}{w}{w}, {t}: Creatures you control get +X/+X
until end of turn. Activate this ability only if you control five or more Mountains.