9 Feb 2017
The triggered ability triggers both when Maulfist Revolutionary enters the battlefield and when it dies. You don’t have to choose only one.
9 Feb 2017
To give a counter is to put a counter on a permanent or to have a player get a counter. Effects that interact with a player getting counters or counters being placed on permanents interact with Maulfist Revolutionary’s triggered ability.
9 Feb 2017
Maulfist Revolutionary’s triggered ability gives only one counter of each kind. It doesn’t double the number of each kind of counter. For example, if a creature has two +1/+1 counters and a charge counter on it, it gets one +1/+1 counter and one charge counter.