Infiltrate!

Benthic Infiltator by Mathias Kollros

Blue-black was no doubt the color of ingest in BFZ (if we exclude exiling noncreature spells).Black has more powerful ingest creature, but blue has evasion ingest creature. Personally, I prefer blue's ingester because your processing will be guaranteed, while you can splash black's ingester in any black deck.

If you followed some articles about BFZ, you might encounter questions regarding ingest / processor ratio. Most processors are fine card without their processing ability, that's their plus, but unless you can trigger them, I think there are better alternative. Unfortunately, I also don't have a lot of clue about what the right ratio is, but I've seen people ingesting so many of my cards without doing anything about it (honestly, that still puts pressure, and having your bomb ingested is not fun). I myself feel that its easier for you to be overloaded with processors, but very few ingesters, that's why I consider blue's ingester, which have better chance to ingest multiple cards over few turns to be more valuable.

Well, good luck trying those "alternative" eldrazi theme in the set!