With cards, people already know the characters to some extent, and they have personal feelings and attachments from playing the games, so you have to make sure there's no disconnect between the pieces and people's expectations
Weve seen Golgari self-mill Standard decks built around maximizing Hollow Marauder and Huskburster Swarm pop up occasionally, and Town Greeter should be a solid inclusion in those decks
In a green-based stompy deck that can give it trample or another form of evasion, Jumbo Cactuar becomes a serious threat, capable of taking over the board the moment it lands
Similarly, a Restock that only gets back permanents sounds quite weak
Special Guests Special Guests cards bring pieces of the Multiverse together, with artwork and flavor themed around their set
In addition, spells or abilities that check the characteristics of a discarded card (such as Chandra Ablaze's first ability) can find that card in exile