View of Vengeance

When View of Vengeance comes into play,
sacrifice a land you control.
{t} : Add {g}{g} to your mana pool. Gain 1 less {g} from this ability for each land in your
graveyard.
{7}{g}, {t} : Create X 6/7 green Penguin tokens
with trample, where X is the number of lands in
each players' graveyard. Sacrifice View of
Vengeance.