The No-Key Gate

This land enters tapped.
{t}: Add {c}{c}.
{x}, {t}, exert a legendary creature you control: Discard X cards at random. Draw cards equal to one less then the amount discarded. If you control permanents named The First Gate and The Magic Mirror Gate, you may spend mana as though it were any color to cast your next spell this turn.
Sacrifice three permanents named: The First Gate, The Magic Mirror Gate and The No Key Gate: Search your hand, library and graveyard for a card named The Southern Oracle and p