Riddle me this… and that… and those…
Anyone up for some arcanyst control madness? Meet Sphynx, the 4 mana 5/4 who puts a Riddle to your opponent’s action bar. The Riddle is a 2 mana spell which blocks the “owner” of the spell from replacing. Spending the 2 mana, you can send the Riddle back to the other player’s action bar and then you can replace again. The exchange of Riddles can potentially go on forever, since the only way to get rid of the card by normal means is to send it to an opponent who has a full hand (then the card is just destroyed). This is an important point for this deck, since if you keep your hand at 5 cards max you can keep the Riddle from being destroyed if your opponent doesn’t draw extra cards for you.
Normally, the Riddle is not such a huge advantage, since the opponent can simply spend the 2 mana and then you, in your turn, have to figure out what to do with it. However, Riddle is also a potentially infinite spell proc triggerer, if you play your cards right. For the powerful Owlbeast-Illusionist-Death Knell basic package Sphynx is actually a pretty neat card: it gives value for every Riddle you cast when you have a Swolobeast or Illusionist out and also slows down the game (since every time the Riddle is cast less total mana is spent until the endgame).
My personal touch on the deck is some funky card choices: Mindwarper is usually used ,unintuitively enough, to copy the opponent’s Riddles, since having two Riddles going back and forth in the game can really wreck the opponent’s game plan. Whereas Archon Spellbinder provides a huge threat to bring back with Death Knell, and serves as combined good body block and disruption when the opponent has blown their removal for cheaper minions. It’s mainly used here though since I just think it’s a cool card 
Furor Chakram is the main finisher of the deck, whenever you have a board of +3 minions out. Knell is more situational depending on the matchup, which is why it’s a 2x. Besides the standard Arcanyst Lili removal package (Ritual, Lure & Lightbender) I chose to use Grasp in the list for some extra AoE against swarm decks and a cheap spell proc. Wanderer lists and Xor are the deck’s better matchups since Sphynx can really give those decks a hard time. On the other hand, it can struggle against commited Burn & Fault. Although Bender and Grasp give the deck a good chance against Fault, Vet has so many powerful tools that sometimes Abyss loses to simple differences in card quality 
WR was 14-6 (70%) in Gold.