Mega Bum is a transformation in Potato Packs, a mod for The Binding of Isaac. It is part of the Potato Pack 4 submod.
Obtained by holding Bomb Bum, Pill Bum, and Rune Bum at the same time.
Combines all 3 aforementioned familiars into Mega Bum, who automatically collects all bombs, pills, and trinkets off the ground and drops twice as many rewards as the regular bums would have.
Part of the Potato Pack 4 mod.