Cliff Ruin Raid

Until end of turn, whenever you attack with one
or more creatures, Draw that many cards and
exile that many cards from the top of your library.
Until end of turn, you may cast nonland cards
exiled with Cliff Ruin Raid, and the cost of those
cards is reduced by one multicolored mana for
each mountain you control.
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"The Ruin Raids and the searches for enlightenment
among the Leylines continue. I call it destiny's sieve."
-Emazra, Enlightened