mtg mind card Magic The Gathering Marvel Super Heroes Mythic Rare The Stone #21 and you may spend mana as though it were mana of any color to cast those spells. Of One Mind MTG -

Number 215 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (10/1/2009) You don't choose the exiled cards until Mirror of Fate's ability resolves

Before moving on, however, I have to point out that this strategy is not nearly as effective as it once was due to Maui Half-Shark

If you choose not to cast any of the exiled nonland cards (either because you can't or don't want to), those cards will remain in exile as well

Waite, Arthur Edward (1979) [1910]

Most of those cards will be creatures, who go into your battlefield to attack and defend in a surprisingly mathematical, tactical back-and-forth