The upgrade is better for investigators with low card draw, but you can't argue with a 4 XP savings for something that will work pretty well in most situations when you need a mid-game mulligan. Although the upgrade would be hilarious with Harvey Walters or any other Big Hand deck.
Cost: 0. XP: 1.
Draw 1 card. Shuffle any number of non-weakness cards from your hand into your deck. Then, draw that many cards.
Ignorance is a bliss you cannot afford.
Harvey Walters #21.