mtg sliver deck commander Constricting Masters Decks | Magic card Collector Booster Sample Pack Slivers - The First Sliver

Whenever you cast a black spell, put a +1/+1 counter on each legendary creature you control

Foretell captures that perfectly: set it aside early, build your forces, and when the moment finally arrives unleash devastation

You can do all three, and only for two mana as well

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Unfortunately Blinky the Eldrazi Displacer brings it back tapped

This will be important later, but basically it prevents undying from triggering if the creature had a +1/+1 counter on it at the time of death