If a permanent with an ability that says it can’t have more than N counters of a certain kind on it has more than N counters of that kind on it, all but N of those counters are removed from it.
January 25, 2019 · Ravnica Allegiance
If a permanent with an ability that says it can't have more than N counters of a certain kind on it has more than N counters of that kind on it, all but N of those counters are removed from it.
September 29, 2017 · Ixalan
If a permanent with an ability that says it can’t have more than N counters of a certain kind on it has more than N counters of that kind on it, all but N of those counters are removed from it.
September 30, 2011 · Innistrad
If a permanent has both a +1/+1 counter and a -1/-1 counter on it, N +1/+1 and N -1/-1 counters are removed from it, where N is the smaller of the number of +1/+1 and -1/-1 counters on it.
June 17, 2011 · Commander 2011
If a permanent has both a +1/+1 counter and a -1/-1 counter on it, N +1/+1 and N -1/-1
February 4, 2011 · Mirrodin Besieged
If a permanent has both a +1/+1 counter and a -1/-1 counter on it, N +1/+1 and N -1/-1 counters are removed from it, where N is the smaller of the number of +1/+1 and -1/-1 counters on it.
October 1, 2010 · Scars of Mirrodin
If a permanent has both a +1/+1 counter and a -1/-1 counter on it, N +1/+1 and N -1/-1
February 1, 2010 · Worldwake
If a permanent has both a +1/+1 counter and a -1/-1 counter on it, N +1/+1 and N -1/-1 counters are removed from it, where N is the smaller of the number of +1/+1 and -1/-1 counters on it.