Scorching Summer

When Scorching Summer enters the battlefield,
you may sacrifice a creature. If you do, each
opponent discards two cards.
{b}{r}: Scorching Summer deals 2 damage to each
creature.
At the beginning of your end step, if at least three
creatures died this turn, search your library for a
card named Barren Autumn, reveal it, put it into
your hand, then shuffle your library.