Binding of Isaac: Four Souls Headless Horseman Promo Card
Secret room

Nice try, Greed.

You found the Headless Horseman's hiding spot, but he can't be bought. Not for coins, not for bombs, not for eleven of them.

He rides along free, one per order, with any Binding of Isaac or Mewgenics order until October 31. Add something you actually want and he'll show up in your cart on his own.