cheapest summonable thug

[militarist]

It's really quite strange to here that some strategy never worth using under any conditions.

Let model a hypothetical situation. You have forge of ancients,good gem income. You have a lot of researches who eat all your budget (you spend remains on hiring bloodhunters) and you want them to continue research instead of fighting. You are advanced with research (you can reach all 9 levels before starting any war). You can not create an army. You have very strong casters. But you can't use casters with no chaff. Partially chaff can be done by blood if you have it. But if not, or not enough?
One of ideas is just cast dragon masters and dozens of dozens of dragons.
The idea can be to create a second line, who does some damage and also have blocking function with these bolas. Of course not 4+ sleepers, but 20+ and maybe quickened by water magic, and maybe even given some additional equipment which is cheaper with forge. I don't know if it works and if it can be countered harder or easier in comparison to equipping indie commanders with rods of phoenix + penetration items though. But in reality if we think where to spend fire gems on items..mayby massed bolas still have some function as a blocker? High prot/MR thughs can also be an option, but if you play against nation which has good access to soul slay, i'm not sure you can rely just on fat thugs to hold the line. And just do cast dragons for second and third line also doesn't sound like the optimal strategy.

I mean midgame battle where hundreads of units are taking part in a battle from each side