Looking Glass

When Looking Glass enters the battlefield target
opponent reveals their hand. You choose a
nonland card from among them and exile it.
You may cast spells exiled with Looking Glass for
as long as they remain exiled, using mana as
though it were mana of any colour to cast them.
"Oh, Atropha, you should have invited me to your housewarming party at Briarwood Estate when you
had the chance." - Melissa