Doomsday Clock

If Doomsday Clock would leave play instead
exile it, then put it back into play.
Whenever a player casts a spell, put a doom
counter on Doomsday Clock. At the end of a
players turn that player rolls a D20. Doomsday
Clock deals damage equal to the number of doom
counters minus the D20 roll result to that player.
Pay 1 life: Put a doom counter on Doomsday
Clock or remove a doom counter from it. Each
player may use this ability but only once per turn.
"Ticktock on the clock but the party never s