Who plays full deathrattle lists? They have literally 4 units and they all fullfill the same basic niche of being decentish melee fighters/tarpits. The hell kind of army is that.
Ironjawz should actually have relativly little issues with guards, weirdknob has aoe mortal wound spells and a maw crusha charging in should easily wipe out a lot of the guards, hell just the charging alone might wipe out the entire starhost if he gets Lucky. The real issue here would be kroak killing the weirdknob and maw krusha...
Greenskins have a fairly effective spell on their shaman as well given that it's another AoE. Again, kroak is more of an issue than the guards here (if it were just the guards you could simply hang back and fire spells at the guards with one or two shamans).
Only the deathrattle truly has no options out of those three. And even if the ironjawz and greenskins options are limited and their shamans can be sniped by Kroak, having that happen 15 times in a row seems a tad unlikely, also, bring more shamans. 'HE can't snipe them all