Faithfull Mending is an instant speed repeatable cantrip, it doesn't do much to advance the game but these cards tend to improve the fluidity of the game and they're scarse in this cube. Gaining life is also a deciding factor to justify this card.

Mnemonic Betrayal add to the appropriate mechanical theme found in . This mechanical theme has 12 cards (2,2%) at this point: Daring Thief, Desertion, Supplant Form, Necroskitter, Puppeteer Clique, Nightveil Specter (wich has a too restrictive cost), Connive // Concoct, Gyruda, Doom of Depths, Expansion // Explosion, Spitting Image, Nihiloor, Geyadrone Dihada. The role of this mechanical theme is to provide more redundancy and surprises in interactions between cards (as lot for cards do more than one thing, it's probable that the opponent bring something usefull to your gameplan...

Judith, the Scourge Diva will help agressive decks. And contribute to aristocrat strategy.

Wrenn and Six is powerfull as a two mana planeswalker and has a card type far too rare in this cube. It also contribute to the landtraffic mechanical theme and may ping some blocker or damage an opponent directly, two usefull things in a aggro deck.

Emmara, Soul of the Accord contribute to life, tap/untap and token mechanics wich is decent for a 2-drop.

Hidden Stockpile is perfect for the aristocrat strategy and even provide card advantage.

Old Rutstein, fill the graveyard and pack three more effects helpfull in any deck. may need a tighter focus in the future but for now this value engine should work.

Tatyova, Benthic Druid contribute to the landtraffic mechanical theme wich now have 49 cards (9,1%). This mechanical theme is centered on with and secondary. As a widespread mechanical theme, it is imperative that every card also contribute to other mechanical themes: in this regard, Tatyova, Benthic Druid contribute to life and card advantage, two other widespread mechanical themes.

Cryptic Pursuit is very interesting annd fit well with everything is know for.

Nahiri, the Harbinger is one more planeswalker wich make for a total of 16 (3%) by also counting sparklers. The card provide card advantage and is multipurpose removal but doesn't add something singular to the cube (wich isn't bad and somewhat inevitable as both of her abilities are needed effects in every decks).