Burn the Pages

Look at the top five cards of your library. You
may reveal an instant or sorcery card from
among them and exile it. Then add mana of any
color to your mana pool equal to that card's
mana value. Put the rest on the bottom of your library in a random order.
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"Don't judge me. I don't destroy these gimoires, I'm
setting free the magical power bound to their pages."