Plains Ruins enters the battlefield tapped.
: Add or to your mana pool.
Put Plains Ruins on top of your library: Add to your mana pool.
: Plains Ruins becomes a 2/1 white and black Knight creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.
to your mana pool. : Plains Ruins becomes a 2/1 white and black Knight creature until end of turn. It's still a land.
