This was an interesting run, for a few reasons.
While I have seen several people aim for and occasionally reach units with 99/99 stats, with these big boned skeletons Calcium Elementals here... as I boosted their health as much as I could, I intentionally avoided boosting their attack at all. This meant, no using milk; Farmers only. In addition to the 3 level 3 Farmers giving each of these guys an extra 4 health every turn, once I had everything set up, I would repeatedly buy 2 extra Farmers to give one of them an extra 3 health (1 for the first Farmer, 2 for the second that upgraded it to level 2), then sell the extra level 2 Farmer. Also, no upgrading them at all, keeping their starting damage at 2... which doubled the amount of time these three were able to stall.
This resulted in the game going on an absolutely ludicrous 28 turns (also having an even more absurd 80 buildings, thanks to all those Farmers). And thus, the King had/was supposed to have so much health that... the extra hearts (pre-emptied because of the 99 stat cap) completely covered the top lane!
Anyway, as for the King fight... I ended up using 2 of my 9 upgraded Blessings. Could have done it with just 1, the first reduced him to just 1 HP left, but I figured it would be best to let my best soldier actually win the fight rather than it and the king getting a mutual kill.