2017-04-18
If Synchronized Strike targets two creatures and one becomes an illegal target before it resolves, the remaining target creature will still be untapped and get +2/+2.
2017-04-18
Synchronized Strike can target an untapped creature. It will still get +2/+2.
2017-04-18
You can cast Synchronized Strike with two, one, or zero targets.
2017-04-18
You can't target the same creature twice to have it get +4/+4.