Insane how fast you can break greed mode with a single item (not the d20)

Gulped a golden Swallowed Penny on floor one of greedmode and went infinite immediately from that one item. Each half heart of damage spawns minimum 2 pennies (with the chance for nickels, dimes, and gold pennies). The shop sells hearts for 3 pennies guaranteeing at least 1 penny profit for every heart worth of damage taken.