Gozalla, Stream Eater

Islandwalk. Trample.
Forecast {4}{u} - Reveal Gozalla, Stream Eater
from your hand: Target opponent puts the
top 3 cards of their library into their
graveyard. Gozalla, Stream, Eater costs {2}
less this turn for each land card sent to the
graveyard this way. (Play this only during
your upkeep and only once each turn.)