The Mechanist’s Lair

Whenever you cast an instant or sorcery card,
add {c} to your mana pool. Use this mana only to
cast instant, sorcery and artifact cards.
{t}: Add {u/r} to your mana pool. You may exile an instant or sorcery from your graveyard. If you do,
add {u}{r} to your mana pool instead.
As long as The Mechanist's Lair is a capital, creatures you control cost {4} less.