Forge Ruins enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Sacrifice Forge Ruins: Add or to your mana pool.
: Forge Ruins becomes a 0/4 green and white Spirit creature with defender until end of turn. It's still a land.
.
: Add 
or 
to your mana pool. or to your mana pool.: Forge Ruins becomes a 0/4 green and white Spirit creature with defender until end of turn. It's still a land.
