(: Add or to your mana pool.)
Whenever Horizon Caldera becomes tapped, it deals 1 damage to you.
: Horizon Caldera becomes a 1/1 red and white Angel Kor creature with first strike until end of turn. It's still a land.
: Add 
or 
to your mana pool.)
: Horizon Caldera becomes a 1/1 red and white Angel Kor creature with first strike until end of turn. It's still a land.
