Multicolor:

Strong/Staples:

None.

Interest:

Dreadwing Scavenger (U): The obvious allusion is to Baleful Strix, but I think this is a clear upgrade over Tomebound Lich and as someone who wants to support madness and discard themes in Blue-Back, this is a great include for me.

Similar:

None.

Unique/Synergy:

Fiendish Panda (U): On its face (without lifegain synergy), this is a bit better than Driver of the Dead and, with Gurgling Anointer creates a cool little synergy package in White-Black. But I think you need to be supporting lifegain or the ceiling on this card just isn’t high enough.

No Interest:

Perforating Artist (U): In most aggressive decks this functionally has haste and unblockable the turn it’s played, but I wouldn’t expect it to survive combat often. I think Judith, the Scourge Diva is better in most Black-Red decks and this doesn’t have any synergy with aristocrats.

Wardens of the Cycle (U): Great art. But I think its trigger wants you to be aristocrats or aggressive, which Black-Green usually isn’t and it’s likely too vulnerable to removal. You’d probably get more from something like Kagha, Shadow Archdruid.

Colorless:

Strong/Staples:
Interest:
Similar:

None.

Unique/Synergy:

Fishing Pole (U): One mana to make a 1/1 every turn is a good rate, but paying 3 mana at the outset is rougher. Still, this is much cheaper than we’ve previously gotten with something like Whirlermaker. I still think it’s probably too slow and too easy to interact with.

No Interest:

Quick-Draw Katana (C): Because the power boost is also limited to your turn, I think you’d rather have the greater flexibility of Vulshok Morningstar].

Ravenous Amulet (U): Being limited to sorcery speed and once-per-turn makes this a lot worse than something like Dockside Chef or Vampire Gourmand.

Shardless Outlander (C): Probably a better version of Sojourner’s Companion in most cubes (although that card is more of a Myr Enforcer). I still don’t think most decks want an over-priced vanilla 7-drop with a mana-fixing alternate mode.

[{Starnheim Memento]] (U): A White Manalith that can also provide some late-game reach. But you’d probably be better off with equipment (Kitesail?) and the deck that is mostly likely to want such reach doesn’t really want to spend 3-mana for a rock.