The First Sliver Mirrodin Besieged a player puts the top

a player puts the top card of their library into their graveyard

each commander creature you control deals damage equal to its power to that creature

−8: Each opponent loses life equal to the number of cards in their graveyard

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among any of the creatures it's being blocked by or is blocking

The First Sliver Mirrodin Besieged a player puts the topCascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) Sliver spells you cast have cascade.