Castle of Impossibility

{t}: Add {c} to your mana pool. If you spent this mana to cast an instant or sorcery, that spell
can't be countered.
Exile the top card of your library, {t}: Add one mana of any color to your mana pool.
Between planes are rifts - zones of tumultuous existence and utter chaos. Here, we can find wonders
of unimaginable design and improbable dimensions.