Phyrexian Corridor

Phyrexian Corridor enters tapped.
When Phyrexian Corridor is untapped, instants
and sorceries targeting Phyrexian spells are
countered unless their controller pays {p/w},{p/u}, or {p/r}.
{t}: Add {w}{u}{r} to your mana pool. Use only to
cast Phyrexian instants or sorceries.