for this build, you need some preparation.

unlock starting helms, consumables, trinkets.
unlock shopkeeper's friend.

unlock omen : bargain
unlock omen : readiness(starting hero have level 1 equipment)
start game with these two omens.

after clear first night, upgrade shopkeeper's friend twice.
(plus omen : bargain, now you can get 60% of price for selling items.)
and sell every items.

build inn.

hire any level 1 hero.
fire three heroes who fought first night.
now you have only level 1 hero.

reroll inn.
all hero in inn is level 1 now.

for level 1 hero,
you need 55 gold(including inn reroll.) for hire,
but hero's equipment selling price is higher than 55 gold.

hire any level 1 hero, and fire him immediately, and sell everything.
you can get free gold. (gold amount depend on unlock and difficulty.)
and repeat it. if inn is empty, reroll it.

infinite gold. easy game. need to patch it.

this is day 1 base at map 5.