When I evaluate a collection, I start by estimating the market value of each card based on its condition (and whether its a card that reliably sells)
Thoughtseize gives the user an insight on the most likely play patterns for the upcoming turns, and can be used proactively to either discard an answer to a threat, disrupt the opponents curve, or strip a vital combo piece out of the opponents hand
For years, reds one-drops were along the lines of Goblin Balloon Brigade and Goblin Digging Team
Much like Hallowed Haunting, it doesn't do much of anything in most decks, but it's pretty insane in a deck full of Spirits and enchantments, often coming down as a 3/3 or 4/4 flying lifelinker that easily grows to an 8/8 or 10/10 if the game goes long
One hit with Lightning will double the damage dealt by your other attackers that turn