Flying
When this creature enters, distribute three +1/+1 counters among one, two, or three target creatures you control.
If some of the creatures are illegal targets as Armament Dragon’s triggered ability resolves, the original distribution of counters still applies and the counters that would have been put on the illegal targets are lost.
You choose how many targets Armament Dragon’s triggered ability has and how the counters are distributed as you put the ability onto the stack. Each target must receive at least one counter.