So, in theory this can literally teleport entire army up to at least mid-field and not scatter between the banners and instruments allow another unit to come in within 6" if it also came in from reserve. So with 3 squads of plague drones that's potentially 3 units of plague bearers coming in from reserve, so using 2 units of plague bearers and one unit of plague drones, I think that is a minimal 24" jump if I put great unclean one in reserve?
After first unit of plague drones with icon teleports 1st unit from reserve, second unit comes in 6" from the first unit from reserve, and if reserve roll for the
GUO is made, that's 12" +
2d6" for jet pack cavalry turn 1, then if reserve roll is made, that is +12" for the chain researc from instrument, then
GUO comes in 6" from second unit that was summoned without a reserve roll so minimal of 25" summoning for the big boss (
GUO). So just a theory as I have to still build this army.
Edit: 12+2(drones) + 6 squad one+6 squad two + 6 actual deep strike= 32" minimal, 42" maximum depending on jet pack roll of plague drones....whoa

so if I get very lucky on turn 2, that is line breaker and guaranteed to assault something turn 3. Against flyers, all I can do is try to cover the entire board.
HQ
Lvl 3
GUO with 2 greater rewards
Troops
13 plaguebearers- plague ridden icon and instrument
12 plaguebearers- icon and instrument
12 plaguebearers- icon and instrument
11 plague bearers- icon and instrument
Fast Attack
3 plague drones- icon
3 plague drones- icon
3 plague drones- icon
Heavy support
Lvl 3 daemon Prince flight, 2 greater rewards
Lvl 3 daemon Prince flight, 2 greater rewards
It is tempting to drop a daemon Prince for 3
Lvl 2 Nurgle heralds to hide in squads and nuke enemies with
ap 3 flamers and possibly a 12" large poisoned
ap 2 blast. Plague swords wound everything on 4+ glance vehicles on 6+. So, possibly entire army can be in enemies face turn 2? Heralds have 2/3 a chance of rolling 12" large blast since Nurgle has 3 powers, Flamer is free. This is very fluffy and pretty tempting to build too.
Edit: technically in addition to the
GUO, I can also hold my 2
DPs in reserve instead of flying in/ starting in my deployment zone, meaning that if the plague drones aren't killed my whole army is probably in your face turn 2