The Ring of Dispacement is an interesting anti-speed artifact.

Firstly, since it can be used by any champion, this gives the Ring a lot of versitility for decks it can be involved in. When any player draws more than the base 3 cards during their turn (Note: If a card reduces the draw, like The Ring of Winter (61/FR) or Two Fisted Player (51/MI), even cards refilling that lose (like Arkhold to negate Ring of Winter) are discarded), they must discard an equal number of cards as drawn. Those discards can come from hand, pool, or formations. The best way to deal with this card is to take it. Draw the extra cards, and find fun things to do with the discards.

You can get rid of cards affecting your cards (like Vistani (78/RL)), or discard cards you have stolen from other players (like with the Curse of the Azure Bonds (4/FR)). You can weed out special silver bullet cards from you hand with new cards. For those decks this really hits hard (like Mulmaster (33/1st) themes), you can get rid of this card with any champion slayer or artifact specific destroyer (like Mordenkainen's Disjunction (46/RR)), since the Ring of Displacement gives it's wielder no immunities.

Therefore, if you play with the Ring, you should attach it to a champion with notable immunities, like Ethereal Champion (508/4th), Lareth, King of Justice (31/DR), or Gib Lhadsemlo (18/NS-chase). This can effectively slow down major speed decks, but doesn't really hurt the casual speeder (just getting extra cards per turn) much, especially if you are using evil attachments on your opponent. The better anti-speed card would be the Doomgrinder (21/MI), if you have the Greyhawk champion to attach it to.

Expect to see this card in a variety of settings and evil plans.