(: Add or to your mana pool.)
Whenever Horizon Flats becomes tapped, it deals 1 damage to you.
: Horizon Flats becomes a 2/1 white and black Angel creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Horizon Flats becomes a 2/1 white and black Angel creature until end of turn. It's still a land.
