Downward Spiral

At the beginning of each end step, if a permanent entered the graveyard from anywhere this turn,
put a +1/+1 counter on Downward Spiral.
Delirium — Sacrifice Downward Spiral: Put all of Downward Spiral's counters on target creature.
Then, that creature deals X damage to each other
creature and each of your opponents, where X is
twice the number of counters on it. Only activate this ability when there are four or more card types
among cards in your graveyard.