Borealis, Comet's Shimmer

Permanent spells you control cost {c} less to cast.

Throne of Comet — If you control both Fissure, Comet's Precursor and Reflection, Comet's Horizon, permanent spells you control cost {c}{c}{c} less to cast instead.

"Now that the three gates are arrived, The Comet can destroy everything we know... we did not in time."