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Kaboom Bot is a cheap Deathrattle minion comparable to Volatile Elemental as a cheap removal minion, but just with 1 added to all numbers and as a Mech. It is also comparable to a delayed, cheaper Bomb Lobber.
Kaboom Bots were originally planned to be token minions summoned by Dr. Boom, Mad Genius' Hero Power, with the idea being that the Boomsday Project version of Dr. Boom is more powerful than his original Goblins vs Gnomes incarnation and thus uses a more powerful version of his classic Boom Bots. When Blizzard moved away from that design for Dr. Boom, the Kaboom Bots instead became a neutral collectible card in the set.