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