Legion Stronghold

Legion Stronghold enters the battlefield tapped.
Activated abilities of Legion Stronghold can
only be activated if you control a mountain
or a plains and no way to produce mana
other than {r},{w} or {c}.
{t}: Add {r}{w} to your mana pool.
{r}{w}: Legion Stronghold becomes a 3/1
artifact creature with first strike until end of turn.