The Marker

Indestructible, creatures you control have Haste,
and Lifelink.
Convergence{x}{x}{x}: Create X 5/5 Black
Necromorph Slasher tokens, then create one for
every creature in all graveyards.
The Signal: At the beginning of your upkeep,
each opponent mills 2 cards, draws 2 cards, then discards 2 creatures.