Superbug

Superbug comes into play with X+X time
counters on it where X=the # of players. At
each players end step, all creatures get X -1/-1
counters where X = # of time counters. This
card may be targeted as if an artifact or land.
Spells that would destroy any card type instead
remove two time counters. Lethal damage
dealt by attacking creatures instead removes 2
time counters. When last time counter is
removed, destroy Superbug & flip next event card.