Gremen, the ForeverShadow

: At the beginning of your upkeep, give target opponent a poison counter (target player losses 1 life at the beginning of their upkeep.
+2: Mark target creature for the ForeverDark, target creature’s controller losses 2 and you gain 2 life
-10: Create the ForeverDark Emblem with “all creatures marked for the ForeverDark are exiled, then removed from the game.