The combination to make Sans in Infinite Craft is Papyrus + Undertale. To make Undertale’s much-loved character, Sans, in Infinite Craft, you will need to combine the elements of Papyrus and Undertale ...
You may not know Japanese developer Yoshiro Kimura by name, but you likely do know of someone who does: Toby Fox, who credited Kimura's 1997 Moon: Remix RPG Adventure as an inspiration for Undertale.