Tilled Earth

Farm{1}{t}:Tap a creature you control. Put a Farm counter on this land.
{t}: Gain a mana color of your choice per Farm counters on this land.
And king Mosiah did cause his people that they
should till the earth. And he also, himself, did till
the earth, that thereby he might not become
burdensome to his people, that he might do according
to that which his father had done.. - Mosiah 6:7