The First Sliver Mirrodin Besieged put an age counter on

put an age counter on this permanent

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

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

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

The First Sliver Mirrodin Besieged put an age counter onCascade (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.