Legendary Creature - Wizard Moonfolk Tough Boys (CTRL to add secondary) Maybeboard Kitsa, Otterball Elite Vigilance Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) : Draw a card, then discard a card
Most importantly is added some value for getting extra dragons from cards, either by creating tokens or playing them for free from hand/deck
Pair it with the likes of Magmakin Artillerist or Marauding Mako (both also from this set) and you get an awful lot out of that three mana
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It's a self-contained box of nonsense to draft with your friends, rather than a draftable set that might also give you a valuable land, or let you build a new Commander deck, or break Legacy
Im not sure they quite fit into this category, but cards which by their very nature hurt only one player very badly are worse to have around than Stonehorn Dignitary