Horizonreach Expanse

Enters the battlefield tapped unless you control
three or more lands. If Horizonreach Expanse
enters the battlefield untapped Scry 1, draw a
card, and gain 1 life.
{t}: Add {1} to your mana pool.
{g/w}{t}: Add {u}, {1}{g} or {1}{w} to your mana pool.
{1}{g/w}{w/u}{t}; Sacrifice Horizonreach Expanse;
destroy target attacking creature with Flying.