Necromancer's Blight

Each player rolls a D20. Then assign
the following to each player in order of who
rolled the highest to lowest.
-Creatures your opponents control get -1/-1 until
the end of your next turn.
-Each opponent loses 2 life.
-Venture into the dungeon.
-Each opponent sacrifices a token artifact each
that can't loses 1 life.(Repeats, the caster of this
spell gains this in addition to other effects)