This card hampers the opponent's ability to use lots of individual low damage. This is particularly effective against Barrel of Monkeys spam.
Compared to Lead Casing, Mass Lead Production is preferred for general use, as the former is niche.
The amount of Armor gain is high enough to be a helpful niche against Adora Bloontonium decks, which tend to have few or no high-damage cards, and neither Adora nor the Miners have high base ATK.
On an unarmored Rock Bloon, a Long Range Rang is enough to bring it to 5 Health, enough to be followed up by any 20 or more damage attack.
Armor bonus increased ― +5 → +15 
Gold cost increased ― 2 → 3
Now displays the Armor keyword
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Mass Detonation on one Bloon (pre-4.4)
Mass Lead Production
Mass Lead Production in play, combined with many rounds of Lead Coating Bloon
