Pokemon Card of the Day #3246: Dusk Stone (Unbroken Bonds)
Dusk Stone was an Item that let you break one of the typical rules of the game, but only if you were using very specific Pokemon. It hard you search your deck for a Mismagius, Honchkrow, Chandelure, or Aegislash, even if they were a GX, that evolved from 1 of your Pokemon in play and put it on the Pokemon to evolve it. Not only that, but you could use it on your first turn or on something that was just put into play.
This was mostly used with the Stage 1's on that list, namely Honchkrow-GX and especially Mismagius. This with Mismagius let you draw cards until you had 7 in your hand, but at the cost of that Pokemon and a Prize. Most decks wouldn't like the trade, but if you had to go through your deck as quickly as possible to get everything set up and could afford the Prize loss it could be worth it. In Expanded, this was another one of the cards that could let you get cards needed to mess with the opponent's hand before they could do anything, and while Dusk Stone was never banned there, the Mismagius it worked well with eventually was. In Standard, this was seen occasionally with Mismagius, mostly in Garchomp & Giratina-GX decks, and with the rather rare Honchkrow-GX to block certain cards from being played.