Virulent Plaguebearer

Infect
Other Rats you control have Wither
When Virulent Plaguebearer deals combat
damage to a player, that player puts a
-1/-1 counter on that many target creatures they control
Upkeep: Put a -1/-1 counter on at least one
target creature you control.
Virulent Plaguebearer gets +1/0 for each
creature with a -1/-1 counter on it.