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Harvey Walters boasts a vast intellect and deep wells of knowledge, which he can share with those around him by granting additional card draw to any investigator at his location

You can use Pack Hourglasses as soon as you get them

However, this usually only applies to new expansions, but an older set is now being impacted too Shrouded Fable

The Vintage ban-list specifically mentions banning the ante cards, so you can Spike for the most powerful card drawing spell of all time: Contract from Below

Minnie also gets a major ability when first deployed, with the Dramatic Entrance feature allowing the player to immediately banish an opposing character with five strength or more