Touch of Phyrexia

Permanently give target creature Infect and 3
Time counters. Each time you give a permanent
a -1/-1 counter or a player a Poison Counter,
remove a Time counter. When the target has
no Time counters gain control of it.
"What worse than finding out your infected?
Watching yourself change day by day knowing
that you will soon be just like us" - Jin-Gitaxis