If you counter their creatures, not only will they be unable to attack with them, but your opponent will lose the element of surprised and be forced to play more cautiously
(The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.) Remove two +1/+1 counters from this creature: Regenerate it
As such, it has the most access to Fireballs, Lightning Bolts, and the best first strike and hasty creatures, like Fervent Champion
Seven Power Seven power is quite impressive on a relatively inexpensive commander, so lets look for ways to leverage that
Id want to be in the +1/+1 counters deck before Id want Starport Security, but the fact that its also a 1-drop means itll probably be quite desirable in that deck