Deadly Dealings

Suspend X—{x}{1}{b/r}. X can't be 0. Spend only
black and/or red mana on X.
Whenever a time counter is removed from
Deadly Dealings while it's exiled, Deadly
Dealings deals X damage to any target, where X
is the number of time counters on it.
Deadly Dealings can't be countered.
You lose the game.