(: Add or to your mana pool.)
Goblin Ruins enters the battlefield tapped.
: Goblin Ruins becomes a 1/1 black and red Goblin creature with first strike until end of turn. It's still a land.
: Add 
or 
to your mana pool.)
: Goblin Ruins becomes a 1/1 black and red Goblin creature with first strike until end of turn. It's still a land.
