2004-12-01 : The creature that’s targeted by Arcbound Fiend’s middle ability doesn’t have to have any +1/+1 counters on it. If it doesn’t have a counter on it when the ability resolves, nothing happens.

2006-09-25 : If this creature gets enough -1/-1 counters put on it to cause its toughness to be 0 or less (or the damage marked on it to be lethal), modular will put a number of +1/+1 counters on the target artifact creature equal to the number of +1/+1 counters on this creature before it left the battlefield.