/micon "Nascent Flash"
/ac "Nascent Flash" <c>
/ac "Nascent Flash" <t>
/ac "Nascent Flash" <2>
/ac "Nascent Flash" <3>
/ac "Nascent Flash" <4-8>
....

Im a WAR main so my party set up is tank > heal > dps so I will always by default target mt/ot. I use this macro but have it set up till 8 for fate parties. This macro give me ease of use and the ability to manually target as well and playing on PS4/controller it makes it so much more easier.