(: Add or to your mana pool.)
At the beginning of your upkeep, Slagheap Castle deals 1 damage to target creature you control.
: Slagheap Castle becomes a 2/1 red and white Troll Giant creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Slagheap Castle becomes a 2/1 red and white Troll Giant creature until end of turn. It's still a land.
