Maulfist Revolutionary

Trample
When Maulfist Revolutionary enters or dies, for each kind of counter on target permanent or player, give that permanent or player another counter of that kind.

Kaladesh Remastered

Trample
When Maulfist Revolutionary enters the battlefield or dies, for each kind of counter on target permanent or player, give that permanent or player another counter of that kind.

Aether Revolt

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.

The triggered ability triggers both when Maulfist Revolutionary enters the battlefield and when it dies. You don’t have to choose only one.

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.